Addressing memory leak in TPHostAnimationController where TPEffectsWindo...

[atljeremy]

...ws were being created and added to an NSSet and never removed/released https://github.com/abyssoft/teleport/issues/10

Changes:

• Replaced NSStringFromClass function calls with a more concise call to class for both CALayer and CATransaction.
• Updated a very verbose [NSNumber numberWithFloat:...] method call with the Obj-C literal representation of simply @(...).
• Addressed memory leak where TPEffectsWindows were being created and stored in the _effectWindows set but never removed/released. This happens every time you drag to the remote machine.

[abyssoft]

The point of the NSStringFromClass was to preserve compatibility with OSes pre-dating CoreAnimation, but I think they can be dropped now so the code can be simplified more (no need for Class objects). Thanks for fixing the leak!