Added RenderBlockOverlayEvent.java

Adds a Forge event which controls whether an overlay is rendered.
Overlays include: First-person fire, Block (when inside a block)
	and water when a player is inside a water block.

Patched for easier manipulation of event

Fixed for Lex

To be squashed

Removed Contructor

Added block XYZ parameters

TODO, the second block overlay event’s XYZ might not be correct