Crusade CB and supplementary events overhaul
Another [big] fix for crusade revolters
Pope, holy order, merc wins crusade: always gift to new character

This is to prevent general weirdness with inheritance of unrelated
lands.  New character will still be of same culture and religion of
giver, as usual, so there will still be an Italian (or Frankish or
Bedouin, etc.)  ruler put in place in these cases.  Non-AI holy order
or mercenary characters will still get the usual opportunities to give
the crusader state away, as weird (but possible) as that case is.
Small changes to crusade supplementary code and lots of annotation
Revoke the_crusade_target when not exported to interactive event
No more duplicate depose_antipope CBs

You will note in the ChangeLog that I've essentially forced Meneth to
make a new commit whenever he prepares a release, because he will have
to modify the ChangeLog to not only remove [BETA-ONLY ISSUE] lines, if
present, but also remove the [BETA] I've slapped next to the current
beta version label.

In light of a couple instances of really good beta feedback, it seemed
important to at least temporarily highlight current beta issues solved
with credit given to those that nailed the problem for us. People are
catching the GitHub/beta bug and frequently updating their copy, so it
seems worth the extra commit. Besides, it might be worthwhile for us to
give a "Many thanks for feedback during the beta to X, Y, and Z," to
our release announcement when relevant.

Will revert ChangeLog if desired.
Give gavelkind faction CB a consistent truce and AI victory/defeat weights
other_succession_on_liege now properly converts non-feudal claimants to feudal
Merge pull request #75 from zijistark/crusade-dev

More crusade work + Unrelated bugfixes