FEATURE: General Statistics Screen
FEATURE: added Stats button on main menu screen
STUB: DiceStatsScreen
FEATURE: support to stats screens on GnuBackgammon Instance
FEATURE: general statistics menu logic
FEATURE: added RESET_ANSWER event
FEATURE: reset button assets
FEATURE: Statistics class (serializable to string)
REFACTORING: added it.alcacoop.backgammon.stats package
FEATURE: StatManager singleton with complete game stats handling (not yet integrated/tested!)
FIX: StatManager constructor
FEATURE: get game stat values
FEATURE: real stats integration in GeneralStatsScreen
FEATURE: General Stats integration in game FSM (stats increments!)
FEATURE: reset game stats flow
CLEANUP
FEATURE: added SelectBox component to skin
FEATURE: dice stats menu handling (navigation + reset)
FIX: scree layout
FIX: added DOUBLES_ROW_4 stat