Scenario expansion

Mostly just adding stuff that I missed in the initial PR. 

- [x] Allow forced/forbidden traits in scenarios
- [x] Limit start location choices based on scenario
- [ ] Fix "Can't find shelter!", (Rebuild Map? What if it has other characters? Suggestions appreciated)
- [ ] Various flags and starting conditions.
- [ ] Add more scenarios
A prison, lab, or military facility would not be a good place to start absent the scenario supporting it.  (You'd need some way to get out, or the knowledge that getting out is a major hardship and you're being paid for that when you pick the scenario.)

Depending on your chosen profession, starting in a grocery or other perishable-food facility may be vastly better (backpacker, cyclist, etc only has to loot & scoot, rather than first getting In) or worse (convict, submissive has no way to store the stuff, and still has to get out).