[Fix] Reset walk/fly speed on login.
[Permission] essentials.speed.<fly|walk> - If a player only has one of these, they will only be able to toggle the given state.
Try to unify player matching for hidden users:
kill, lightning and ptime still need cleanup
Add some missing hidden checks
[Permission] essentials.vanish.interact - Players with this permission will be able to interact with hidden players.
Use correct getPlayer method to not match offline users.
Update messages_pl.properties

Update Polish translation.
Add the max-walk-speed config variable back to the default config file.
Tweak ess version
Don't allow an empty list value.
Abort user login code, if user disconnects before it runs.
[Feature] Stack more mobs with /spawnmob
Uses same syntax, now supports more than 2 mobs