Rendering cleanup

Replaces the reflexive instantiation of the Renderes with a factory
method.

Some optimizations to the renderers to no longer push the whole OpenGL state to the stack.

General cleanup of duplicate code, etc

src/main/java/appeng/client/render/blocks/RenderBlockEnergyCube.java

@@ -67,6 +67,7 @@ public class RenderBlockEnergyCube extends BaseBlockRender<BlockEnergyCell, Tile
 		final int meta = world.getBlockMetadata( x, y, z );
 
 		renderer.overrideBlockTexture = blk.getIcon( 0, meta );
+
 		final boolean out = renderer.renderStandardBlock( blk, x, y, z );
 		renderer.overrideBlockTexture = null;