Refactored code so chooseSuit and chooseCard were generic and can be
used in any situation of choosing a suit or card. Placed playing card
code into playCardPrompt.

Need to implement passing for human player now.
Passing works for human player now.

Plus some bug fixes.
Maybe do some code refactoring.
Otherwise, only UI left to do.
Refactored ComputerPlayer code to use HashTable properly
Did some refactoring and code cleaning.