Add setting to not colorize own nick according to xep-0392

Some users might want there nick to always stay white (etc) for easier
recognition.

Now we can do `/color own off` to not generate the color based on
xep-0392. The `me=` color (etc) from the theme will then be used.

Once we run this command `theme_load()` is called again.
And the theme looks totally wrong.
We encountered this at other times already and I think it's nothing
wrong with this new code here now but that there seems to be a missing
closing attr for the color when drawing.

Should be investigated seperately.

Fix https://github.com/profanity-im/profanity/issues/1288

src/command/cmd_ac.c

@@ -958,6 +958,7 @@ cmd_ac_init(void)
     autocomplete_add(color_ac, "off");
     autocomplete_add(color_ac, "redgreen");
     autocomplete_add(color_ac, "blue");
+    autocomplete_add(color_ac, "own");
 
     correction_ac = autocomplete_new();
     autocomplete_add(correction_ac, "on");
@@ -3758,6 +3759,11 @@ _color_autocomplete(ProfWin *window, const char *const input, gboolean previous)
 {
     char *result = NULL;
 
+    result = autocomplete_param_with_func(input, "/color own", prefs_autocomplete_boolean_choice, previous, NULL);
+    if (result) {
+        return result;
+    }
+
     result = autocomplete_param_with_ac(input, "/color", color_ac, TRUE, previous);
     if (result) {
         return result;

src/command/cmd_defs.c

@@ -2322,22 +2322,25 @@ static struct cmd_t command_defs[] =
     },
 
     { "/color",
-        parse_args, 1, 1, &cons_color_setting,
+        parse_args, 1, 2, &cons_color_setting,
         CMD_NOSUBFUNCS
         CMD_MAINFUNC(cmd_color)
         CMD_TAGS(
             CMD_TAG_UI)
         CMD_SYN(
-            "/color on|off|redgreen|blue")
+            "/color on|off|redgreen|blue",
+            "/color own on|off")
         CMD_DESC(
             "Settings for consistent color generation for nicks (XEP-0392). Including corrections for Color Vision Deficiencies. "
             "Your terminal needs to support 256 colors.")
         CMD_ARGS(
-            { "on|off|redgreen|blue", "Enable or disable nick colorization for MUC nicks. 'redgreen' is for people with red/green blindess and 'blue' for people with blue blindness."})
+            { "on|off|redgreen|blue", "Enable or disable nick colorization for MUC nicks. 'redgreen' is for people with red/green blindess and 'blue' for people with blue blindness."},
+            { "own on|off", "Enable color generation for own nick. If disabled the color from the color from the theme ('me') will get used."})
         CMD_EXAMPLES(
             "/color off",
             "/color on",
-            "/color blue")
+            "/color blue",
+            "/color own off")
     },
 
     { "/avatar",

src/command/cmd_funcs.c

@@ -8694,6 +8694,10 @@ cmd_color(ProfWin *window, const char *const command, gchar **args)
             prefs_set_string(PREF_COLOR_NICK, "redgreen");
     } else if (g_strcmp0(args[0], "blue") == 0) {
             prefs_set_string(PREF_COLOR_NICK, "blue");
+    } else if (g_strcmp0(args[0], "own") == 0) {
+        if (g_strcmp0(args[1], "on") == 0) {
+            _cmd_set_boolean_preference(args[1], command, "Color generation for own nick", PREF_COLOR_NICK_OWN);
+        }
     } else {
         cons_bad_cmd_usage(command);
         return TRUE;