PvP Toggle by Kenokey

Initial release.

Players toggle their own PvP with /pvp on and /pvp off. Admins can do it for
anyone with /pvp @player on|off, offline players included.

- Blocks melee, projectiles, harmful potions, player-lit TNT, tamed pets,
  Fire Aspect, Flame arrows and fishing rods - each configurable
- Works both ways: with PvP off you also cannot hit others
- Anti-abuse on turning PvP off: combat lock, countdown that any hit cancels,
  and a cooldown. Turning it on is always instant
- Optional new player protection and forced-PvP arena worlds
- English and German included, other languages via a copied lang file

Requires Paper 26.2 or a Paper fork. Does not run on plain Spigot.