Moved common commands to CardGame.java.

Commands common to both games with the same permissions and functions were moved to the superclass as part of the ongoing effort to clean up the code. This refactoring should not change any game behaviour.
Worked on issues #65,#95. Added help files.

Added ability for "ghelp" to output usage details for individual commands. Added .help files for Blackjack and Texas Hold'em poker. These files are to be copied to the run directory of the bot. Help files still incomplete. Added a delay before shutdown in ExampleBot to reduce shutdown errors.