Resolve ModTweaker #670: Centrifuge morb support

[noobanidus]

I believe this resolves #670 without adding issues. I'm not sure if the coding is to the same style. It's been a while since I've done anything with Java, but it was something that was bothering me as well.

[kindlich]

Could you also add a method override that accepts IEntityDefinition objects?

Check their wiki entry (1st link) and the CrT implementation (2nd link):

• https://crafttweaker.readthedocs.io/en/latest/#Vanilla/Entities/IEntityDefinition/
• https://github.com/CraftTweaker/CraftTweaker/blob/1.12/CraftTweaker2-MC1120-Main/src/main/java/crafttweaker/mc1120/entity/MCEntityDefinition.java

[noobanidus]

I've added the methods for IEntityDefinition, that was my oversight. I've either fixed or responded to your other concerns in reply to your comments. Thanks for looking over this! Like I said, I haven't written anything in Java in about four years and this is my first foray into Minecraft modding.