Finished seperating BoundsBox.py

Added Missing import, fixed typo in import

Added Functions which had been missed from initial move 1f5921445cb166e1459b9a509e0bee34e8326b1a
Added Missing import
Removed Pose2DBox, BoundsWidget, BoundsBox classes

Added imports replacing removed classes. 
Now imported from new location in ompl_gui package. 

Tested -- working