Implemented automatic rotation

Implemented automatic rotation for all tile blocks. You can still use
facing properties in model files, if you want to.

Also, some added some fixes and improvements.

src/main/java/appeng/client/ClientHelper.java

@@ -378,7 +378,10 @@ public class ClientHelper extends ServerHelper
 	@SubscribeEvent
 	public void onModelBakeEvent( final ModelBakeEvent event )
 	{
-
+		for( IAEFeature feature : Api.INSTANCE.definitions().getFeatureRegistry().getRegisteredFeatures() )
+		{
+			feature.handler().registerCustomModelOverride(event.getModelRegistry());
+		}
 	}
 
 	@SubscribeEvent