Grace Karanja 8d1e4557a9 Add UndoCommand class
Add a class to handle all undo/redo events. Whenever a user
action affects a dive, an undo command will be created. A list of
these commands will be stored in the UndoBuffer, to allow for
moving forwards/backwards in the list.

Signed-off-by: Grace Karanja <gracie.karanja89@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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