adjust stack display & game credits

the stack will display the latest object always on TOP so we can see
which will resolve first, the last to resolve will always be on
bottom... also increase credit bonus. default is 500 credits and for
momir will be 800 credits.

projects/mtg/include/GameApp.h

@@ -74,6 +74,7 @@ public:
     static bool HasMusic;
     static string systemError;
     static char mynbcardsStr[512];
+    static int mycredits;
     static JMusic* music;
     static string currentMusicFile;
     static void playMusic(string filename = "", bool loop = true);