[MERGED PR] Slot machines directly use bank account balance

[Frank_Stein]

To address the issue of embezzlement, I have a few ideas

1. Have the slot machines only pay out in cash
2. Have a cash in/cash out mechanic

• Cash in by swiping card, entering pin, then selecting an amount to digitally transfer to the machine from the account
  
• Play from the pool you deposited, winnings are added to pool
  
• When you're ready to quit, cash out by once again entering your pin, and then having the current pool amount dumped into your account