Put a player's starting cash $$ into PokerLib

Use it to initialize both the handscreen and the table. This will get
overridden quickly once a hand is dealt and ante is subtracted, but
there's enough time for the value to flicker on the client screen and it
looks like a bug if it goes from 100k to 49k.
On a fold, make the players' cards invisible

The protocol is that the server always acknowledges every action the
player requests and only then does the player change anything. So ACK
the Fold action, and upon that ACK make the cards invisible. You won't
be in the round anymore so the ACTION_ACKNOWLEDGE callback won't be
invoked again until you are no longer folded.
Don't wait for the server ack on a Fold

Just make the cards invisible right away because reasons.
Merge pull request #2 from newmanne/scottFixes

Scott fixes