updates to the LevelEditor

-Added in Delete functionality to Editor
-Can now Delete any enemy with Right Click. Note that ONLY ENEMIES WITH 0
ROTATION HAVE BEEN TESTED. Enemies with non-0 rotation may crash; to be
tested soon.
-Fixed bug where Right-Click could place Enemies.
-Continued to clean up code where needed.
-Implemented Bounding Boxes for Enemies for Deletion.