Move fading to menu to separate variables

Alright, so what I've done here is made exiting to the menu entirely
separate from Terry's State Machine, and thus it can now take place
entirely within MAPMODE instead of having to go back to GAMEMODE. Also,
it's faster by 15 frames since we don't need to wait for the map screen
to go back down.

desktop_version/src/Game.cpp

@@ -370,6 +370,9 @@ void Game::init(void)
     playry = 0;
     playgc = 0;
 
+    fadetomenu = false;
+    fadetomenudelay = 0;
+
     /* Terry's Patrons... */
     superpatrons.push_back("Anders Ekermo");
     superpatrons.push_back("Andreas K|mper");

desktop_version/src/Game.h

@@ -381,6 +381,8 @@ public:
 
     void quittomenu();
     void returntolab();
+    bool fadetomenu;
+    int fadetomenudelay;
 };
 
 extern Game game;

desktop_version/src/Input.cpp

@@ -1812,6 +1812,19 @@ void mapinput()
     game.press_action = false;
     game.press_map = false;
 
+    if (game.fadetomenu)
+    {
+        if (game.fadetomenudelay > 0)
+        {
+            game.fadetomenudelay--;
+        }
+        else
+        {
+            game.quittomenu();
+            game.fadetomenu = false;
+        }
+    }
+
     if(graphics.menuoffset==0)
     {
         if (graphics.flipmode)
@@ -1970,6 +1983,8 @@ void mapinput()
                 graphics.fademode = 2;
                 music.fadeout();
                 map.nexttowercolour();
+                game.fadetomenu = true;
+                game.fadetomenudelay = 15;
             }
         }