Interessanti fix che dovrebbero migliorare l'esperienza PvE

* Fixed an issue with AI that allowed players to kite melee monsters at the border of their attack range and kill them without taking any damage.

* New server-side navigation mesh better matching deployed server world and monsters. Many monsters should stop evading (stay in place, refuse to engage the player and return to full health immediately after player attack).

* Fixed an exploit that allowed players to duplicate credits by using mail improperly.