Added Google Game Play Service implementation, still needs alot of work. Simplified startGameMachine in GameActivity. Converted GameMachine into Builder pattern to simply setting up the different game modes.
Improved Google Play Game implementation. Playing mostly works, completing the games only works for the person that does the winning blow. Need to add possibilites for leaving games and some other stuff.
Moved away from getters/setters in player/card and effect classes to possibly improve performance.
Minor changes
Merge branch 'googleplay'

Merge the google play feature into main