Update Javadocs

Summary

Update the Javadocs to latest version. lots is missing so it can make the development process quite easier, even if its missing comments and whatnot.

Usage

Javadocs are a great tool for devs, however, its hard to utilize MythicMobs Javadocs because they are so outdated.

Value

Same as above, this makes the life of devs a lot easier.

Priority

Medium, not hard to add, doesnt even have to be commented, having a good idea of what does and doesn't exist is good enough.

Implementation

Not sure what you guys use but mvn javadoc:javadoc usually does it 🤯