Created command methods in TexasPoker.

Also moved a couple methods in TexasTourney.
Created command methods in TexasTourney.

Also fixed some messages that weren't updated for TexasTourney (ie. can't
start, can't join). isXAllowed() is no longer being used in the updated
games with command methods, but they haven't been removed and may be used
again in the future.
Fixed up processCommand() in TexasPoker.

Removed call to super.processCommand() and added the commands from
super.processCommand().
Removed "bet" confirmation message in Blackjack.

The code has been commented out. Similar code in TexasPoker and
TexasTourney have been added back in and commented out.
Added non-op command methods for Blackjack.