Modular Factions: Diplomacy Module Enabled

The diplomacy module has been enabled. This allows factions to form alliances.
Alliances allow faction members to be members of multiple factions and to switch between them easily.
Allied factions will share excess membercount for calculating faction module requirements.

Bugs:
- Fixed some issues relating to how faction ownership was calculated with subfactions.
There may still be further issues relating to how faction ownership is calculated.
If you do find an issue, please report it and do not abuse it. Any abuses will be enforced by the golden rule.
- Fixed an issue where Quest NPCs were showing up when they shouldn't.