• Forge version: 1.10.2-12.18.3.2185
• RTG version: 4.1.2.2

Issue Description:

I have a dimension creation system in my mod, and when I tried to create a dimension with RTG world type, it crashed. So I looked at your code and saw that you are allowing RTG to work only in dimension 0, otherwise it throws exceptions.

Steps to reproduce the issue:

1. Make a dimension with id other than 0.
2. Attempt to create it with RTG world type.

I would be grateful if you allowed RTG worlds to be created in other dimensions.

@AlexiyOrlov This is already on our TODO list for 1.11, but due to the possible complexity of removing the dimension restriction, and of it possibly being a breaking change, it's something that may not get backported to 1.10.

Added for 1.10.2 in ee80ee5

fixed in bb9f773