Crusader state succession law normalization whenever it changes hands or is newly created (Critical for release)

Crusader state succession laws, and those of all of its de jure vassal titles, are converted to an appropriate, feudal-style set of laws whenever necessary (e.g., when the Pope, a holy order, or a mercenary company wins the crusade).

Fixes long-standing bugs that could have been increased in frequency due to recent changes.  Also fixes AI de jure capital-setting and -conversion under such circumstances.  Also closes a loophole that could accidentally grant the new crusader state to a heretic or infidel.

Tested and such.  This should definitely be included in the upcoming release.