Support for vanilla enchantment incompatibilities

[left-on-red]

So I really like everything that exists in here so far. and I forked it to modify it to my liking (namely the incompatibilities that can't be specified in the config.) And with that, I really wanted custom enchantment vs vanilla enchantment incompatibilities so things like Ice Aspect and Fire Aspect are mutually exclusive. But right now, incompatibilities only exist between custom enchantments. I tried to implement this additional functionality myself, but I'm not a Java developer and I'm even less of a Spigot developer, so I wasn't able to make it work.