[Request] Add a config for the explosion size

[koiboi-dev]

I like the idea of diesel being able to explode, but it would be nice if we were able to configure how powerful the explosion and be able to put a cap on it.

Im running a server with this mod on it and its terrifying just how large the explosions can get, as people are planning on using it as a form of weaponry.

[hideki2k02]

Up on this, a explosion just happened and it destroyed all entities within a 500 block radius of spawn! (If the server did not have FTB Chunks the spawn would've been gone).