Possible fix for the game tree sometimes showing up blank
Gets rid of some warnings and unused files
Merge branch 'team9dev' into saveButtonFix
Changes the visibility of the undo button

Undo button's visibility is changed to match that of the save button. If
the user has any changes, the undo button will be visible, but if no
changes were made, the button will be grayed out.

Author: dbtrue