Removed old rendering system

Removed old rendering system. Some parts may be left over, but they
won't affect testing.
1.10-R todo tag marks things to do with rendering.

src/main/java/appeng/block/spatial/BlockMatrixFrame.java

@@ -38,8 +38,6 @@ import net.minecraftforge.fml.relauncher.Side;
 import net.minecraftforge.fml.relauncher.SideOnly;
 
 import appeng.block.AEBaseBlock;
-import appeng.client.render.BaseBlockRender;
-import appeng.client.render.blocks.RenderNull;
 import appeng.core.features.AEFeature;
 import appeng.helpers.ICustomCollision;
 
@@ -57,12 +55,6 @@ public class BlockMatrixFrame extends AEBaseBlock implements ICustomCollision
 		this.setFeature( EnumSet.of( AEFeature.SpatialIO ) );
 	}
 
-	@Override
-	protected Class<? extends BaseBlockRender> getRenderer()
-	{
-		return RenderNull.class;
-	}
-
 	@Override
 	@SideOnly( Side.CLIENT )
 	public void getCheckedSubBlocks( final Item item, final CreativeTabs tabs, final List<ItemStack> itemStacks )