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
- [x] Achieve cheese equilibrium
- [x] Make it more clear which locations you can/cannot pick.

Various flags and starting conditions.

Add more scenarios
The Subject Suit is designed for non-voluntary mutant lab test subjects.  Any reason you're not using it?