Created a class that identifies faces that to not need to be rendered.
Made each armour part build it's faces before rendering.
Armour parts now build a display list on first render and use it from then on.
Removed debug text.
Items in the entity model cache are now removed after 5 minutes.
Armour only renders on mannequins that are closer than 40 blocks.
Merge pull request #3 from RiskyKen/armour-face-culling

Armour face culling