Implement Betting mechanism per player

[codegard1]

Each player has a bank prop that is the amount of money they have left to play with.

• [x] Each time _bet() is called, subtract the bet amount from player's bank and add it to Table state's pot
• [x] When a new round starts, automatically 'bet' for each player (_ante())
• [x] notify the player when _ante()occurs
• [x] Replace the New Game option in CommandBar with "New Round"
• [x] add roundCount to Table state
• [x] increment roundCount like turnCount, but don't reset turnCount when _resetGame() is called

[codegard1]

this doesn't seem right somehow _ante() { const players = this.state.players; players.forEach(player, index => { this._bet(null, null, index, this.state.minimumBet); }); }