Added copy operators for game's static instance

Player
CommandParser can be swapped but not copied.

main.cpp

@@ -4,8 +4,7 @@ int main(int argc, char *argv[]) {
     Game game; // Calls default constructor which Initializes GAME
 
     if (!game) {
-        game.Init();
-        Game::SetGameInstance(&game);
+        game = Game::Instance();
     }
     while (game.GetIsActive()) {
         game.Run();