Final mod support pass for the initial release

NO BALANCING WORK HAS BEEN DONE YET. THIS IS JUST A "GET IT ALL TO START A NEW WORLD" JOB AT THE MOMENT.

Mods that either don't work or don't have a 1.6.* release at all are of course missing at this time.

Metallurgy 3 only just fits in here, so let's hope it doesn't get much bigger!