Add postgame stats for UNO

[NeedToLookAtMyPictures]

See issue #114 and PR #161. Postgame stats have been implemented for blackjack (US and EU) and poker, but not the other games.

[shihabhasan0161]

@NeedToLookAtMyPictures, can you assign this to me?

[NeedToLookAtMyPictures]

@NeedToLookAtMyPictures, can you assign this to me?

Assigned! Sorry for the delay.