Removes 'proto' dir

See #137 for the issue.

Every header in the proto directory was:

* Given include guards in the form

    #ifndef NEOVIM_FILENAME_H
    #define NEOVIM_FILENAME_H
        ...
    #endif /* NEOVIM_FILENAM_H */

* Renamed from *.pro -> *.h
* Moved from src/proto/ to src/

This would have caused conficts with some existing headers in src/;
rather than merge these conflicts now (which is a whole other can of
worms involving multiple and conditional inclusion), any header in src/
with a conflicting name was renamed from *.h -> *_defs.h (which may or
may not actually describe its purpose, the change is purely a
namespacing issue).

Once all of these changes were made a script was developed to determine
what #includes needed to be added to each source file to describe its
dependencies and allow it to compile; because the script is so short
and I'll just list it here:

    #! /bin/bash

    cd $(dirname $0)

    # Scrapes `make` output for provided error messages and outputs #includes
    # needed to resolve them.
    #   $1 : part of the clang error message between filename and identifier
    list_missing_includes() {
        for file_missing_pair in $(CC=clang make 2>&1 >/dev/null | sed -n "s/\/\(.*\.[hc]\).*$1.*'\(.*\)'.*/\1:\2/p"); do
            fields=(${file_missing_pair//:/ })
            source_file=${fields[0]}
            missing_func=${fields[1]}
            # Try to find the declaration of the missing function.
            echo $(basename $source_file) \
                \#include \"$(grep -r "\b$missing_func __ARGS" | sed -n "s/.*\/\(.*\)\:.*/\1/p")\"
        # Remove duplicates
        done | sort | uniq
    }

    echo "Finding missing function prototypes..."
    list_missing_includes "implicit declaration of function"
    echo "Finding missing identifier declarations..."
    list_missing_includes "use of undeclared identifier"

Each list of required headers was added by hand in the following format:

    #include "vim.h"
    #include "*_defs.h"
    #include "filename.h"
    /* All other includes in same module here, in alphabetical order. */
    /* All includes from other modules (e.g. "os/*.h") here in alphabetical
     * order. */

src/misc2.h

@@ -0,0 +1,136 @@
+#ifndef NEOVIM_MISC2_H
+#define NEOVIM_MISC2_H
+/* misc2.c */
+int virtual_active __ARGS((void));
+int getviscol __ARGS((void));
+int getviscol2 __ARGS((colnr_T col, colnr_T coladd));
+int coladvance_force __ARGS((colnr_T wcol));
+int coladvance __ARGS((colnr_T wcol));
+int getvpos __ARGS((pos_T *pos, colnr_T wcol));
+int inc_cursor __ARGS((void));
+int inc __ARGS((pos_T *lp));
+int incl __ARGS((pos_T *lp));
+int dec_cursor __ARGS((void));
+int dec __ARGS((pos_T *lp));
+int decl __ARGS((pos_T *lp));
+linenr_T get_cursor_rel_lnum __ARGS((win_T *wp, linenr_T lnum));
+void check_cursor_lnum __ARGS((void));
+void check_cursor_col __ARGS((void));
+void check_cursor_col_win __ARGS((win_T *win));
+void check_cursor __ARGS((void));
+void adjust_cursor_col __ARGS((void));
+int leftcol_changed __ARGS((void));
+void vim_mem_profile_dump __ARGS((void));
+char_u *alloc __ARGS((unsigned size));
+char_u *alloc_clear __ARGS((unsigned size));
+char_u *alloc_check __ARGS((unsigned size));
+char_u *lalloc_clear __ARGS((long_u size, int message));
+char_u *lalloc __ARGS((long_u size, int message));
+void *mem_realloc __ARGS((void *ptr, size_t size));
+void do_outofmem_msg __ARGS((long_u size));
+void free_all_mem __ARGS((void));
+char_u *vim_strsave __ARGS((char_u *string));
+char_u *vim_strnsave __ARGS((char_u *string, int len));
+char_u *vim_strsave_escaped __ARGS((char_u *string, char_u *esc_chars));
+char_u *vim_strsave_escaped_ext __ARGS((char_u *string, char_u *esc_chars,
+                                        int cc,
+                                        int bsl));
+int csh_like_shell __ARGS((void));
+char_u *vim_strsave_shellescape __ARGS((char_u *string, int do_special));
+char_u *vim_strsave_up __ARGS((char_u *string));
+char_u *vim_strnsave_up __ARGS((char_u *string, int len));
+void vim_strup __ARGS((char_u *p));
+char_u *strup_save __ARGS((char_u *orig));
+void copy_spaces __ARGS((char_u *ptr, size_t count));
+void copy_chars __ARGS((char_u *ptr, size_t count, int c));
+void del_trailing_spaces __ARGS((char_u *ptr));
+void vim_strncpy __ARGS((char_u *to, char_u *from, size_t len));
+void vim_strcat __ARGS((char_u *to, char_u *from, size_t tosize));
+int copy_option_part __ARGS((char_u **option, char_u *buf, int maxlen,
+                             char *sep_chars));
+void vim_free __ARGS((void *x));
+int vim_stricmp __ARGS((char *s1, char *s2));
+int vim_strnicmp __ARGS((char *s1, char *s2, size_t len));
+char_u *vim_strchr __ARGS((char_u *string, int c));
+char_u *vim_strbyte __ARGS((char_u *string, int c));
+char_u *vim_strrchr __ARGS((char_u *string, int c));
+int vim_isspace __ARGS((int x));
+void ga_clear __ARGS((garray_T *gap));
+void ga_clear_strings __ARGS((garray_T *gap));
+void ga_init __ARGS((garray_T *gap));
+void ga_init2 __ARGS((garray_T *gap, int itemsize, int growsize));
+int ga_grow __ARGS((garray_T *gap, int n));
+char_u *ga_concat_strings __ARGS((garray_T *gap));
+void ga_concat __ARGS((garray_T *gap, char_u *s));
+void ga_append __ARGS((garray_T *gap, int c));
+void append_ga_line __ARGS((garray_T *gap));
+int name_to_mod_mask __ARGS((int c));
+int simplify_key __ARGS((int key, int *modifiers));
+int handle_x_keys __ARGS((int key));
+char_u *get_special_key_name __ARGS((int c, int modifiers));
+int trans_special __ARGS((char_u **srcp, char_u *dst, int keycode));
+int find_special_key __ARGS((char_u **srcp, int *modp, int keycode,
+                             int keep_x_key));
+int extract_modifiers __ARGS((int key, int *modp));
+int find_special_key_in_table __ARGS((int c));
+int get_special_key_code __ARGS((char_u *name));
+char_u *get_key_name __ARGS((int i));
+int get_mouse_button __ARGS((int code, int *is_click, int *is_drag));
+int get_pseudo_mouse_code __ARGS((int button, int is_click, int is_drag));
+int get_fileformat __ARGS((buf_T *buf));
+int get_fileformat_force __ARGS((buf_T *buf, exarg_T *eap));
+void set_fileformat __ARGS((int t, int opt_flags));
+int default_fileformat __ARGS((void));
+int call_shell __ARGS((char_u *cmd, int opt));
+int get_real_state __ARGS((void));
+int after_pathsep __ARGS((char_u *b, char_u *p));
+int same_directory __ARGS((char_u *f1, char_u *f2));
+int vim_chdirfile __ARGS((char_u *fname));
+int illegal_slash __ARGS((char *name));
+char_u *parse_shape_opt __ARGS((int what));
+int get_shape_idx __ARGS((int mouse));
+void update_mouseshape __ARGS((int shape_idx));
+int crypt_method_from_string __ARGS((char_u *s));
+int get_crypt_method __ARGS((buf_T *buf));
+void set_crypt_method __ARGS((buf_T *buf, int method));
+void crypt_push_state __ARGS((void));
+void crypt_pop_state __ARGS((void));
+void crypt_encode __ARGS((char_u *from, size_t len, char_u *to));
+void crypt_decode __ARGS((char_u *ptr, long len));
+void crypt_init_keys __ARGS((char_u *passwd));
+void free_crypt_key __ARGS((char_u *key));
+char_u *get_crypt_key __ARGS((int store, int twice));
+void *vim_findfile_init __ARGS((char_u *path, char_u *filename, char_u *
+                                stopdirs, int level, int free_visited,
+                                int find_what, void *search_ctx_arg,
+                                int tagfile,
+                                char_u *rel_fname));
+char_u *vim_findfile_stopdir __ARGS((char_u *buf));
+void vim_findfile_cleanup __ARGS((void *ctx));
+char_u *vim_findfile __ARGS((void *search_ctx_arg));
+void vim_findfile_free_visited __ARGS((void *search_ctx_arg));
+char_u *find_file_in_path __ARGS((char_u *ptr, int len, int options, int first,
+                                  char_u *rel_fname));
+char_u *find_directory_in_path __ARGS((char_u *ptr, int len, int options,
+                                       char_u *rel_fname));
+char_u *find_file_in_path_option __ARGS((char_u *ptr, int len, int options,
+                                         int first, char_u *path_option,
+                                         int find_what, char_u *rel_fname,
+                                         char_u *suffixes));
+int vim_chdir __ARGS((char_u *new_dir));
+int get_user_name __ARGS((char_u *buf, int len));
+void sort_strings __ARGS((char_u **files, int count));
+int pathcmp __ARGS((const char *p, const char *q, int maxlen));
+int filewritable __ARGS((char_u *fname));
+int emsg3 __ARGS((char_u *s, char_u *a1, char_u *a2));
+int emsgn __ARGS((char_u *s, long n));
+int get2c __ARGS((FILE *fd));
+int get3c __ARGS((FILE *fd));
+int get4c __ARGS((FILE *fd));
+time_t get8ctime __ARGS((FILE *fd));
+char_u *read_string __ARGS((FILE *fd, int cnt));
+int put_bytes __ARGS((FILE *fd, long_u nr, int len));
+void put_time __ARGS((FILE *fd, time_t the_time));
+int has_non_ascii __ARGS((char_u *s));
+/* vim: set ft=c : */
+#endif /* NEOVIM_MISC2_H */