Never give a crusader state to a heretic or infidel
Crusader state succession law normalization when non-feudal character wins

Fixes long-standing bugs that could have been increased in frequency
due to recent changes.  Also fixes AI de jure capital-setting under
such circumstances.
Merge pull request #80 from zijistark/crusade-dev

Crusader state succession law normalization whenever it changes hands or is newly created (Critical for release)
Added a number of comments
Merge branch 'beta' of https://github.com/Meneth/PB-git into beta