patch 8.2.4825: can only get a list of mappings

Problem:    Can only get a list of mappings.
Solution:   Add the optional {abbr} argument. (Ernie Rael, closes #10277)
            Rename to maplist().  Rename test file.
diff --git a/src/proto/map.pro b/src/proto/map.pro
index 88e61bd..f92339f 100644
--- a/src/proto/map.pro
+++ b/src/proto/map.pro
@@ -8,7 +8,7 @@
 int map_to_exists(char_u *str, char_u *modechars, int abbr);
 int map_to_exists_mode(char_u *rhs, int mode, int abbr);
 char_u *set_context_in_map_cmd(expand_T *xp, char_u *cmd, char_u *arg, int forceit, int isabbrev, int isunmap, cmdidx_T cmdidx);
-int ExpandMappings(char_u *pat, regmatch_T *regmatch, int *num_file, char_u ***file);
+int ExpandMappings(char_u *pat, regmatch_T *regmatch, int *numMatches, char_u ***matches);
 int check_abbr(int c, char_u *ptr, int col, int mincol);
 char_u *eval_map_expr(mapblock_T *mp, int c);
 char_u *vim_strsave_escape_csi(char_u *p);
@@ -17,7 +17,7 @@
 int put_escstr(FILE *fd, char_u *strstart, int what);
 void check_map_keycodes(void);
 char_u *check_map(char_u *keys, int mode, int exact, int ign_mod, int abbr, mapblock_T **mp_ptr, int *local_ptr);
-void f_getmappings(typval_T *argvars, typval_T *rettv);
+void f_maplist(typval_T *argvars, typval_T *rettv);
 void f_maparg(typval_T *argvars, typval_T *rettv);
 void f_mapcheck(typval_T *argvars, typval_T *rettv);
 void f_mapset(typval_T *argvars, typval_T *rettv);