Add ai.GetAll()

[BREEDNKMs]

Description

g_AI_Manager.AccessAIs is used multiple times in order to iterate through NPCs whenever needed, but existing iterators are only for Players and All entities.

Whenever we create a custom AI, we require to iterate through all entities just to check for other NPCs such as relationships, state of other NPCs, NPCs close to a square etc...

Including the pre-existing AI table iterator will help us improve base AI performance with multiple AIs.