Renamed BaseCard to CardInstance.
Changed filenames of BaseCard.
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Implemented Behaviors.ICounter interface;
Implemented game commands for adding/removing counters on card;
Implemented Passive_DeathOnAccumulatedCounter utilizing the counters system;
Implemented rendering of counters.
Replaced players' avatar.
Merge branch 'master' of https://github.com/galaxyyao/TouhouGrave