Shashki - Russian draughts

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+ Small fixes
[v11.20.0]
+ 12th AI level
+ Openings & online player visualization
+ Appended new openings
+ Other small fixes
[Previous]
+ Renewed Avatars and changed/improved Chat policy
+ Bluetooth fix for 12/13 Androids
+ Added Nicaragua/Paraguay/Senegal
+ Ads critical fix
+ New puzzles
+ Other fixes
+ Implemented Petrov's triangle - AI can win 3vs1 king