Pull fix for improved sprint from mangos

- https://github.com/mangoszero/server/commit/1781ac3c1e2219eaa0ce42663bc7e85b319ff482
Fix all the loot foo
Fix distance group loot bug

- Verify player is within max distance when deciding next looter
Begin to allow all player to loot if creature already looted
Fix loot release bug

- Allow all group players to loot after authorized looter has released
  loot window with loot still on corpse
Fix looting of skinned creature

- Fix problem where player would close the loot window after skinning
  without taking the items
Rewrite permissions and other shit

- MATT - LootMgr.cpp:628
Added proper checks for FFA loot.
Hackfix for a segfault happening with .die

- It appears when a GM .die's certain mobs/bosses, the recipient looter
  is not set properly, returning a NULL pointer, which was then being
  used.
- This is a hackfix, it should be considered temporary.