[0163] Fixed equipment for creatures 16194, 16215, 16216

* Updated equipment for creatures 16194 (Unholy Axe), 16215 (Unholy
Staff), 16216 (Unholy Swords), as it currently wrong, especially for
Unholy Staff
* Added missing equipement with correct model for creature 16215
(Unholy Staff)
* Allowed creature 16216 (Unholy Sword) to dual wield
This closes #35 thanks to Swater96 for searching and testing.