[Add] Reset some GUI variables when creating a new game.

src/player.c

@@ -239,6 +239,9 @@ void player_new(void) {
   vectnull(&player_cam);
   gl_bindCamera(&player_cam);
 
+  gui.radar.res = RADAR_RES_DEFAULT;
+  memset(msg_stack, 0, msg_max * sizeof(Msg));
+
   /* Setup sound. */
   player_initSound();