Handle player sitting out

[piggydoughnut]

• [x] style controls
• [x] show controls when its not players active turn
• [x] send sitout to the backend at the end of the game if the player continues or not

[sg777]

The backend expecting the sitout info from the GUI is as follows: Where the value 0 means the player is not opting for sitout or the player is willing to play next hand.

{
method: sitout
 value : 0
}