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/components/StateMapperComponent.java

@@ -31,7 +31,7 @@ import net.minecraftforge.fml.relauncher.Side;
 /**
  * Registers a custom state mapper for a given block.
  */
-public class StateMapperComponent implements PreInitComponent
+public class StateMapperComponent implements ModelRegComponent
 {
 
 	private final Block block;
@@ -45,7 +45,7 @@ public class StateMapperComponent implements PreInitComponent
 	}
 
 	@Override
-	public void preInitialize( Side side )
+	public void modelReg( Side side )
 	{
 		ModelLoader.setCustomStateMapper( block, stateMapper );
 		if( stateMapper instanceof IResourceManagerReloadListener )