Make better Esc menu functional

So now the options do what they do. However, I still need to fix the
1-frame glitch when switching to TITLEMODE, as well as make returning
from the menu return back to MAPMODE, as well as making this better menu
integrate seamlessly with the existing menus.

desktop_version/src/Input.cpp

@@ -2079,6 +2079,29 @@ void mapmenuactionpress()
         game.fadetolab = true;
         game.fadetolabdelay = 16;
         break;
+    case 30:
+        // Return to game
+        graphics.resumegamemode = true;
+        break;
+    case 31:
+        // Go to quit prompt
+        music.playef(11);
+        game.menupage = 10;
+        break;
+    case 32:
+        // Graphic options
+        music.playef(11);
+        game.gamestate = TITLEMODE;
+        game.createmenu(Menu::graphicoptions);
+        map.nexttowercolour();
+        break;
+    case 33:
+        // Game options
+        music.playef(11);
+        game.gamestate = TITLEMODE;
+        game.createmenu(Menu::options);
+        map.nexttowercolour();
+        break;
     }
 }