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/FeatureFactory.java

@@ -23,6 +23,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Supplier;
 
+import appeng.bootstrap.components.ModelRegComponent;
 import net.minecraft.block.Block;
 import net.minecraft.item.Item;
 import net.minecraftforge.client.model.IModel;
@@ -129,6 +130,11 @@ public class FeatureFactory
 		this.bootstrapComponents.add( component );
 	}
 
+	void addModelReg( ModelRegComponent component )
+	{
+		this.bootstrapComponents.add( component );
+	}
+
 	void addPostInit( PostInitComponent component )
 	{
 		this.bootstrapComponents.add( component );