Fixed UAWUnitType isn't available in PayloadSource.

[liplum]

1. It should be noted it's awful that vanilla used anonymous class to declare every content.
2. Block#configure will detect whether this class is anonymous then use its super class.
3. If you want to hide those units in your mod in payload source, just close this pull request.
4. I can't build and test my code because of Cannot use "annotationProcessor "com.github.Anuken:jabel:$jabelVersion" Anuken/MindustryJavaModTemplate#12, please test it on your own.

[liplum]

I think you don't have to add this dispensable annotation in 85fa97e. It's just my regulation.