Introduce nvim namespace: Move files.

Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.

src/nvim/buffer.h

@@ -0,0 +1,81 @@
+#ifndef NEOVIM_BUFFER_H
+#define NEOVIM_BUFFER_H
+/* buffer.c */
+int open_buffer(int read_stdin, exarg_T *eap, int flags);
+int buf_valid(buf_T *buf);
+void close_buffer(win_T *win, buf_T *buf, int action, int abort_if_last);
+void buf_clear_file(buf_T *buf);
+void buf_freeall(buf_T *buf, int flags);
+void goto_buffer(exarg_T *eap, int start, int dir, int count);
+void handle_swap_exists(buf_T *old_curbuf);
+char_u *do_bufdel(int command, char_u *arg, int addr_count,
+                  int start_bnr, int end_bnr,
+                  int forceit);
+int do_buffer(int action, int start, int dir, int count, int forceit);
+void set_curbuf(buf_T *buf, int action);
+void enter_buffer(buf_T *buf);
+void do_autochdir(void);
+buf_T *buflist_new(char_u *ffname, char_u *sfname, linenr_T lnum,
+                   int flags);
+void free_buf_options(buf_T *buf, int free_p_ff);
+int buflist_getfile(int n, linenr_T lnum, int options, int forceit);
+void buflist_getfpos(void);
+buf_T *buflist_findname_exp(char_u *fname);
+buf_T *buflist_findname(char_u *ffname);
+int buflist_findpat(char_u *pattern, char_u *pattern_end, int unlisted,
+                    int diffmode,
+                    int curtab_only);
+int ExpandBufnames(char_u *pat, int *num_file, char_u ***file,
+                   int options);
+buf_T *buflist_findnr(int nr);
+char_u *buflist_nr2name(int n, int fullname, int helptail);
+void get_winopts(buf_T *buf);
+pos_T *buflist_findfpos(buf_T *buf);
+linenr_T buflist_findlnum(buf_T *buf);
+void buflist_list(exarg_T *eap);
+int buflist_name_nr(int fnum, char_u **fname, linenr_T *lnum);
+int setfname(buf_T *buf, char_u *ffname, char_u *sfname, int message);
+void buf_set_name(int fnum, char_u *name);
+void buf_name_changed(buf_T *buf);
+buf_T *setaltfname(char_u *ffname, char_u *sfname, linenr_T lnum);
+char_u *getaltfname(int errmsg);
+int buflist_add(char_u *fname, int flags);
+void buflist_slash_adjust(void);
+void buflist_altfpos(win_T *win);
+int otherfile(char_u *ffname);
+void buf_setino(buf_T *buf);
+void fileinfo(int fullname, int shorthelp, int dont_truncate);
+void col_print(char_u *buf, size_t buflen, int col, int vcol);
+void maketitle(void);
+void resettitle(void);
+void free_titles(void);
+int build_stl_str_hl(win_T *wp, char_u *out, size_t outlen, char_u *fmt,
+                     int use_sandbox, int fillchar, int maxwidth,
+                     struct stl_hlrec *hltab,
+                     struct stl_hlrec *tabtab);
+void get_rel_pos(win_T *wp, char_u *buf, int buflen);
+void fname_expand(buf_T *buf, char_u **ffname, char_u **sfname);
+char_u *alist_name(aentry_T *aep);
+void do_arg_all(int count, int forceit, int keep_tabs);
+void ex_buffer_all(exarg_T *eap);
+void do_modelines(int flags);
+int read_viminfo_bufferlist(vir_T *virp, int writing);
+void write_viminfo_bufferlist(FILE *fp);
+char_u *buf_spname(buf_T *buf);
+int find_win_for_buf(buf_T *buf, win_T **wp, tabpage_T **tp);
+void buf_addsign(buf_T *buf, int id, linenr_T lnum, int typenr);
+linenr_T buf_change_sign_type(buf_T *buf, int markId, int typenr);
+int buf_getsigntype(buf_T *buf, linenr_T lnum, int type);
+linenr_T buf_delsign(buf_T *buf, int id);
+int buf_findsign(buf_T *buf, int id);
+int buf_findsign_id(buf_T *buf, linenr_T lnum);
+void buf_delete_signs(buf_T *buf);
+void buf_delete_all_signs(void);
+void sign_list_placed(buf_T *rbuf);
+void sign_mark_adjust(linenr_T line1, linenr_T line2, long amount,
+                      long amount_after);
+void set_buflisted(int on);
+int buf_contents_changed(buf_T *buf);
+void wipe_buffer(buf_T *buf, int aucmd);
+
+#endif /* NEOVIM_BUFFER_H */