V1.6.6 New Rule Variants for Rummy, Blackjack, and Others

[h3]Blackjack[/h3]
+ Splitting can be enabled in the rules

[h3]Twenty-One[/h3]
+ Bugfix: Dealer rotation every x rounds did not work

[h3]Rummy[/h3]
+ Initial melds can consist of multiple sets (configurable)
+ Configurable: when players can start adding to other players' melds
+ Number of cards is configurable
+ Card score values are configurable
+