Scenario expansion

Mostly just adding stuff that I missed in the initial PR. 

-Allow forced/forbidden traits in scenarios: Done
-Limit start location choices based on scenario : In progress
-Various flags and starting conditions.
-Add more scenarios
Currently it charges points.  Agreed that lab-only might be a better fit, but then you're in the lab challenge scenario too.  Random middle-of-woods in a damaged subject suit maybe?