More dummy classes to improve code hygiene

Added NibbleArray dummy class to eliminate remaining Cauldron-guarding
reflection. Added EntityRenderer and Tessellator dummy classes to
eliminate CLEntityRenderer and CLTessellator interfaces, slightly
simplify the corresponding transforms.
Removed Cauldron support

Eliminated the last workarounds for Cauldron
Merge pull request #19 from Murray65536/MoarDummyClasses

Added additional dummy classes and finished removing Cauldron workarounds.  ASM references can now be made with 80% less ASM!