* Use AI::AttackStart calls only in case explicit request creature attack from core or AI code "attack it if can".
Like taunt, pet handler attack command.
* Use AI::AttackedBy for reaction at hostile action "do something at hostile action"
Like non-dot damage, swing, negative spell landing, or fade fear/etc.
And provided by default call AttackStart if no current target.
This fix some problems, like:
* Civilian will react propertly at attack by another creature (not pet or player).
* Will not cases (at least triggred by core) when attack target start run to attacker before any real hostile action apply.
Also send pointer to AI constructors ans mark constructors as explicit.
This changes allow move now some generic often used AI code to CreatureAI helper functions.
* Use WorldObject phase mask field instead explicit aura scan. This allow have phase for any world objects.
* Add phase checks to packet broadcasters/object searchers. This let correctly work say/yell/area
and multi/random target spells/aggro assistance in phased areas or target selection.
* In GM-mode character presense (see and visible) in all phases except normal visibility efects including GM-visibility.
TODO: summoned objects phase set base at owner phase, load phase mask for creatures/gameobjects from DB, in game commands.
