Add menu for selecting the level font

By default, when you open the level editor to start a new level, the
level font will now match your VVVVVV language; so if you're, say,
Japanese, then you can make Japanese levels from the get-go. If you
want to make levels for a different target audience, you can change the
font via a new menu (map settings > change description > change font).
The game will remember this choice and it will become the new initial
level font.

desktop_version/src/Script.cpp

@@ -2592,13 +2592,16 @@ void scriptclass::startgamemode(const enum StartMode mode)
         game.gamestate = GAMEMODE;
     }
 
+    // Font handling
     switch (mode)
     {
-    case Start_EDITOR:
     case Start_EDITORPLAYTESTING:
     case Start_CUSTOM:
     case Start_CUSTOM_QUICKSAVE:
         break;
+    case Start_EDITOR:
+        font::set_level_font_new();
+        break;
     default:
         font::set_level_font_interface();
     }