Remove unused reset method
Add hooks for game object deallocation
Deallocate webGL objects when game starts, also remove mouse listeners when game finishes
Move memory deallocation function to Util, also unbind mouse listener when go back to main menu
Remove unneeded get camera degrees to rotate
Deallocate webGL objects in menu background now
Merge branch 'memory' - deallocate webGL objects for both the 3d menu background and 3d game