Fixes validation of requirements on create game

Uses a TableModelListener to validate whether a game has at least one
requirement.

Authors: dbtrue, ammesonb
Begins create game requirement validation

Also, fixes some formatting.

Authors: dbtrue, ammesonb
Finishes create game requirement validation

Adds error labels and action listeners

Author: ammesonb dbtrue
Merge branch 'team9dev' into validate-data-check
Fixes save button bug

Disables save button on new game requirement dialog on initial launch

Author: ammesonb
Merge pull request #43 from dbeckwith/validate-data-check

Validate data check