Moderate nerf of elective faction & some consistency fixes

- Regular factions (non-autonomy) will now now wait to submit a revolt ultimatum until after their liege is no longer using ANY of the 3 holy war CBs in PB
- Moderate nerf of the feudal elective faction. It is generally more tolerant than the other succession factions, more easily dissuaded/coerced, less subject to transient issues which will definitely be solved-- at least by the AI-- in due time, and generally slower to jump to an ultimatum
- AI realms must be at true min. CA to qualify for the elective faction (crown_levies_1 was previously allowed).  Player realms still qualify for the elective faction with min. CA except for crown_levies_1, as previously
- Testing shows that it's quite possible, e.g., for an AI France to avoid an overwhelming elective faction revolt within 5 years of the 1066 start (previously a problem) but that the faction still remains a threat in such scenarios
- In general, in combination with the CA revocation cooldown, this should slow down the currently-rampant ahistorical AI realm degeneration into elective