Adds run-paper plugin support as well as moves majority of logic to kotlin build scrips Co-authored-by: Josh Roy <10731363+JRoy@users.noreply.github.com>
Gradle is better than Maven, don't @ me. okay but actually it's [faster](https://www.youtube.com/watch?v=atuFSv2bLa8&feature=youtu.be&t=77), compiles and tests in parallel more efficiently, and more epic stuff).