Fixed crash caused by delayed block registration.

Added Callback section for the Model Registry event to the builder setup.
Moved the State Mapper section to the Model Registry Callback section.

src/main/java/appeng/bootstrap/IBootstrapComponent.java

@@ -32,6 +32,10 @@ public interface IBootstrapComponent
 	{
 	}
 
+	default void modelLoader( Side side )
+	{
+	}
+
 	default void initialize( Side side )
 	{
 	}