This file has an interesting history with content that goes all the way
back to MobArena's dark days of both Ant and Eclipse. This commit cleans
up the file a bit, removing a lot of unnecessary bits and pieces, and
making it a little more tightly bound to the current project setup.
The purpose of this is to actually commit to version control the jar(s) necessary to compile. It's not a best practice whatsoever, but if we can commit gradle wrappers, we can commit hard-to-incorporate binary dependencies.
As a nice side effect, it should be possible to run some basic CI tooling on the repository.
