BecomeActive, Thinking Entities

This is very probably obsoleted by the recent AI code re-organisation, so this page could be deleted

Originally written by Ishtvan on http://forums.thedarkmod.com/topic/4146

If you give an entity a new ::Think method, be sure to call BecomeActive( TH_THINK ) in the spawn method, otherwise the ::Think will only get called once and then no more.