* 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 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.
