refactor!: remove 'terse' option

Having two methods of setting the same option is redundant and can be
potentially confusing. Recommend adding 's' to 'shortmess' instead.

src/nvim/option.c

@@ -4049,18 +4049,6 @@ static char *set_bool_option(const int opt_idx, char_u *const varp, const int va
       // buf->b_p_swf
       mf_close_file(curbuf, true);              // remove the swap file
     }
-  } else if ((int *)varp == &p_terse) {
-    // when 'terse' is set change 'shortmess'
-    char *p = vim_strchr((char *)p_shm, SHM_SEARCH);
-
-    // insert 's' in p_shm
-    if (p_terse && p == NULL) {
-      STRCPY(IObuff, p_shm);
-      STRCAT(IObuff, "s");
-      set_string_option_direct("shm", -1, IObuff, OPT_FREE, 0);
-    } else if (!p_terse && p != NULL) {  // remove 's' from p_shm
-      STRMOVE(p, p + 1);
-    }
   } else if ((int *)varp == &p_paste) {
     // when 'paste' is set or reset also change other options
     paste_option_changed();

src/nvim/option_defs.h

@@ -678,7 +678,6 @@ EXTERN int p_tr;                ///< 'tagrelative'
 EXTERN char_u *p_tags;          ///< 'tags'
 EXTERN int p_tgst;              ///< 'tagstack'
 EXTERN int p_tbidi;             ///< 'termbidi'
-EXTERN int p_terse;             ///< 'terse'
 EXTERN int p_to;                ///< 'tildeop'
 EXTERN int p_timeout;           ///< 'timeout'
 EXTERN long p_tm;               ///< 'timeoutlen'

src/nvim/options.lua

@@ -2529,9 +2529,9 @@ return {
     },
     {
       full_name='terse',
-      short_desc=N_("hides notification of search wrap"),
+      short_desc=N_("No description"),
       type='bool', scope={'global'},
-      varname='p_terse',
+      varname='p_force_off',
       defaults={if_true=false}
     },
     {