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/mark.h

@@ -0,0 +1,42 @@
+#ifndef NEOVIM_MARK_H
+#define NEOVIM_MARK_H
+
+#include "buffer_defs.h"
+#include "mark_defs.h"
+#include "pos.h"
+
+/* mark.c */
+int setmark(int c);
+int setmark_pos(int c, pos_T *pos, int fnum);
+void setpcmark(void);
+void checkpcmark(void);
+pos_T *movemark(int count);
+pos_T *movechangelist(int count);
+pos_T *getmark_buf(buf_T *buf, int c, int changefile);
+pos_T *getmark(int c, int changefile);
+pos_T *getmark_buf_fnum(buf_T *buf, int c, int changefile, int *fnum);
+pos_T *getnextmark(pos_T *startpos, int dir, int begin_line);
+void fmarks_check_names(buf_T *buf);
+int check_mark(pos_T *pos);
+void clrallmarks(buf_T *buf);
+char_u *fm_getname(fmark_T *fmark, int lead_len);
+void do_marks(exarg_T *eap);
+void ex_delmarks(exarg_T *eap);
+void ex_jumps(exarg_T *eap);
+void ex_changes(exarg_T *eap);
+void mark_adjust(linenr_T line1, linenr_T line2, long amount,
+                 long amount_after);
+void mark_col_adjust(linenr_T lnum, colnr_T mincol, long lnum_amount,
+                     long col_amount);
+void copy_jumplist(win_T *from, win_T *to);
+void free_jumplist(win_T *wp);
+void set_last_cursor(win_T *win);
+void free_all_marks(void);
+int read_viminfo_filemark(vir_T *virp, int force);
+void write_viminfo_filemarks(FILE *fp);
+int removable(char_u *name);
+int write_viminfo_marks(FILE *fp_out);
+void copy_viminfo_marks(vir_T *virp, FILE *fp_out, int count, int eof,
+                        int flags);
+
+#endif /* NEOVIM_MARK_H */