[FIXED] NPCs are unable to walk through player ghosts

[Xuri]

NPCs are unable to walk through player ghosts, and since they also seem incapable of pathfinding around characters, players can cooperate and block the monsters so they cannot reach their target - allowing them to easily kill melee monsters with magic/missile weapons without any danger of getting killed (well, except for the ghost who's blocking).

[Grimson]

This will be fixed with my next commit.

[Xuri]

Excellent