Professions changes

Finishes implementation of Profession Selection interface (adds display for skills and addictions)

Reworks profession balance, so that the main question isn't "should I take a profession?" but rather "which profession should I take"? Each has distinct advantages - but most come with drawbacks now as well.

Makes it so not every profession is guaranteed to start with a knife and lighter, as well.

Does not include all the old professions, but lays a strong base reference for how they should be set up and how much they should cost. I'll be doing more professions over the weekend if this gets merged. Need to pull over some of the bionics professions, at least.