Implement TemporarySummon Linked aura to owner.

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Автор: cyberium


<pre style='white-space:pre-wrap;width:81ex'>Implement TemporarySummon Linked aura to owner.

This will add 2 possibilities for a temporary summoned creature.
- To be unsomoned when aura that created that summon is removed from owner.
- To remove aura of the owner when this summon is dead.

This also add AI unsumon hook (why it was not implemented?)

These two case are always needed for possessed summon (creature spawned to be possessed)
There must be other case where we can use it and thus "generalize" its use instead of handle this in aura remove.
Maybe @xfurry know better than me on this.</pre>


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