I'm looking for feedback on this one. For example, what do you think about xp drain? Are the default values too aggressive? Did you just end up turning it off or turning it down?

Changelog

• Add boolean rule <effect>_xp_drain which can toggle xp drain when near a beacon of the specified effect.
• Add double rule <effect>_xp_drain_rate which can change the rate at which xp is consumed by the expression xp points drained = xp level * <effect>_xp_drain_rate
• Fix broken carpet setDefault which would silently fail.