Server: add objects limit in games

Some card combos can auto-generate too much objects (thanks to skip buttons too). It can freeze the server (AI or other calculations), make memory overflow and etc.

So it can be useful to add default settings in server's config and close the game on too much objects count.

TODO:
* add config's param: `maxGameObjects` (default: 3000);
* what's to check:
* permanents on battlefield;
* objects on stack;
* cards amount in libraries, hands and other zones;
* If sum of all game objects >= 3000 then end the game;
* Player with lowest objects count will win the game, all other will lose (or maybe it will be draw, hmm).