Third update pass (3/?)

Last (?) update pass. AE2 can be launched and used (?) in game.

Rendering system changed again and again - rendering is NOT working, to
be rewritten and CAN be done a lot simpler.

src/main/java/appeng/core/ApiDefinitions.java

@@ -58,7 +58,7 @@ public final class ApiDefinitions implements IDefinitions
 		return this.handlers;
 	}
 
-	FeatureRegistry getFeatureRegistry()
+	public FeatureRegistry getFeatureRegistry()
 	{
 		return this.features;
 	}