Anti-PvP upgrade

[Tyler Waugh]

Currently people can attack a player standing outside the spawn protection from inside the spawn protection. Checking both the attacker and defender for area protections should solve this issue.

[Stefan Steinheimer]

updating onDamage/onAttack to work in 1.6; fixing PvP bow exploit; requiring both players be outside protected area for PvP, closes issue #6

→ <<cset d44500abdea6>>