Remove redundant Glass/Prism event wrappers

Most of the input events (key, mouse, input methods) are delivered from Glass to SceneGraph through the wrappers. That is, the event is first wrapped to an intermediate object (e.g. GlassPrismKeyEvent), then Quantum converts it to the public FX event and dispatches to SceneGraph. This level of abstraction was introduced to support Glass/Newt abstraction, and it doesn't make any sense nowadays.