- Refactored Reference(s) names: 	BlockReference, ItemReference ->
									BlockReferences, ItemReferences;
- Added IGuiHandler to CommonProxy: now receives "signal" from the
blocks when trying to open GUI (to disable logging, go to
CommonProxy.java, look under getClientGuiElement(...) and comment out
System.out.println("Was called!");). GUILensBench acts weirdly, miss
textures and doesn't really open... but does signal the IGuiHandler
(CommonProxy.java).

- Added onBlockActivated to BlockLensBench. Added GUI Ids to References:
look under OtherReferences for the IDs.