* It was wasting CPU power as cell-level locking is not needed.
* Future multithreading will be on map-level.
* CellLock was just a 'proxy' between Cell and CellPair and in some cases carried redundant data.
* Some minor cleanup in Cell::Visit/Map::Visit.
* Added basic infrastructure for visibility update in case difference player and current view point.
Just for note: seletect additional arg way beacuse repeatable search object will slow but store pointer will not safe,
so use middle case: get view point pointer early as possible at visibility updates.
* Implement dynamic object and creature activisation while it's target of far sight spell effect
* Use this for SPELL_AURA_BIND_SIGHT, SPELL_AURA_FAR_SIGHT and SPELL_EFFECT_ADD_FARSIGHT.
* Note2: some spyglass like spells let look _around_ at long distance, this hard implement in current grid loading system
Without additional changes and not implemented (you will see empty area without creatures in likes case)
* Also fixed warning spam at CMSG_MOVE_SET_CAN_FLY_ACK receive by use proper packet sructure reading.
* 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.
