Instance init

- So that simi can have his cogs.
 - Inheritance is painful when models are acquired in an instance's ctor

src/main/java/com/jozufozu/flywheel/backend/instancing/AbstractInstance.java

@@ -29,6 +29,13 @@ public abstract class AbstractInstance implements IInstance, ILightUpdateListene
 		this.world = world;
 	}
 
+	/**
+	 * Initialize models here.
+	 */
+	public void init() {
+
+	}
+
 	/**
 	 * Free any acquired resources.
 	 */

src/main/java/com/jozufozu/flywheel/backend/instancing/InstanceManager.java

@@ -286,6 +286,7 @@ public abstract class InstanceManager<T> implements MaterialManagerImpl.OriginSh
 		AbstractInstance renderer = createRaw(obj);
 
 		if (renderer != null) {
+			renderer.init();
 			renderer.updateLight();
 			LightUpdater.get(renderer.world)
 					.addListener(renderer);