1.6: Updated book / relic's belief replacer function

1.6: Added few fail-safe to avoid unexpected hediff removal.

1.6: Added consolidated HediffGiver: HediffGiver_FaithOrCorrupted
1.6: Fixed logic that manages label of Belief.

1.6 Migration done.

1. C# update - variable stat bonus (mainly for Let the Galaxy burn) logic changed. Now instead of directly mutate hediff, it gives statPart bonus to the designated pawns.

1. CompBeliefRelic won't affect to pawn that is not spawn or dead. Just for sanity check purpose.

1. Refactor Thought and Precept related code for better performance.
2. Fixed Precept workers don't work as intended.
3. Changed the way of how Belief Label is changed by corruption level.
4. Added new flag of isPawnCorrupted to Hediff_Belief for better and performance driven filtering.
5. Added Dev Mode only Gizmo that increase Hediff_Belief level by 1.
6. Now CompBeliefRelic provides inspection and description stings to users easily identify which item gives what kind of belief.

1. Refactor code to improve performance by caching some logic.
2. Fixed Book related errors.

Minor C# tune to avoid unexpected errors when the Relic isn't Belief giver.

Fixed bug that Relic either doesn't properly giving Belief to pawn or recharging Faith.