Vampire fixes

Fixes a span class overspilling into plaintext, cleans up a commented out pointless hackaround, lowers the Secret reqs a bit to factor in our pop and the apparent interest in playing it, fixes the one-vamp-at-20 issue by making the game scale it upwards from 1, not zero - so that there will be two vampires for the 10-19 player range, instead of 1.
I'm using TortoiseGit. It's just that I'm gonna have to delete all the local files, clone Urist again, clone my fork again, resolve the merge conflicts, update my fork, and only then I'll be able to do shit properly again.