Factions Proper

General bug fixes, including a bug that prevented a feature to avoid players leaving and joining factions to reset their power from working.

Added config options:

• Whether attackers in a siege glow
• How many attackers must die for a siege to fail, or the ability to disable this feature entirely (not recommended)
• How many blocks away the attackers can go before the siege fails, or the ability to disable this feature entirely (not recommended)
• Ability for additional players in a faction to add to the total faction power, but this is disabled by default