ALL plugins which used either class must be recompiled to be compatible with this version.

I realize that this is the second breaking change in a row. After this, breaking changes will be largely avoided to ensure backwards compatibility. However, CommandArgumentType needed to be removed and put into a new file, ArgType. It was an internal class of Command, which extended the file to be much longer than it should have been. And CommandArgumentType is a very lengthy class name, hence the rename to ArgType. All documentation should be updated already, but let me know if I missed any. As RedLib grows, I want to make sure its older parts remain clean and maintainable, and I will be using better coding practices to ensure breaking changes can be avoided in the future.