2.5.0

This update contains some refactoring to the reflection and class loading methods which are used to load expansions and injectors from independent jar files.

I also cleaned up / refactored a few other things and while you won't notice any of these internal changes in this update, it makes things easier and cleaner for me in the future

This version has also been deployed to the maven repo for anyone who depends on PlaceholderAPI. No API changes have been made so you can update if you choose to. It isn't necessary though