Silence various warnings in builds removing content

The MAKEANDPLAY, NO_CUSTOM_LEVELS, and NO_EDITOR defines remove content
or features. However, they then raise several warnings because of some
cases, functions, or variables that end up not being used.

This silences them by using the UNUSED macro, or by adding a default
catch-all case if the define is defined (so unhandled cases will still
raise warnings in a build that doesn't have these defines).

desktop_version/src/Game.cpp

@@ -25,6 +25,7 @@
 #include "RoomnameTranslator.h"
 #include "Screen.h"
 #include "Script.h"
+#include "Unused.h"
 #include "UtilityClass.h"
 #include "VFormat.h"
 #include "Vlogging.h"
@@ -4207,7 +4208,9 @@ void Game::deletesettings(void)
 
 void Game::unlocknum( int t )
 {
-#if !defined(MAKEANDPLAY)
+#ifdef MAKEANDPLAY
+    UNUSED(t);
+#else
     if (map.custommode)
     {
         //Don't let custom levels unlock things!
@@ -6821,6 +6824,11 @@ void Game::createmenu( enum Menu::MenuName t, bool samemenu/*= false*/ )
         option(loc::gettext("ok"));
         menuyoff = 50;
         break;
+#ifdef NO_CUSTOM_LEVELS
+    /* Silence warnings about unhandled cases. */
+    default:
+        break;
+#endif
     }
 
     // Automatically center the menu. We must check the width of the menu with the initial horizontal spacing.
@@ -7198,7 +7206,9 @@ void Game::returntoingame(void)
 
 void Game::unlockAchievement(const char* name)
 {
-#ifndef MAKEANDPLAY
+#ifdef MAKEANDPLAY
+    UNUSED(name);
+#else
     if (map.custommode)
     {
         return;