[10465] Implement SPELL_EFFECT_REDIRECT_THREAT

[newsbot]

<pre>m src/game/HostileRefManager.cpp
m src/game/HostileRefManager.h
m src/game/Spell.h
m src/game/SpellEffects.cpp
m src/game/ThreatManager.cpp
m src/game/ThreatManager.h
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10465] Implement SPELL_EFFECT_REDIRECT_THREAT

Note: all spells with effect expect additional code for redirection reset.
Until code adding redirection work longer that expected.

Signed-off-by: VladimirMangos <vladimir@getmangos.com>

Patch partly rewrited with move new data into HostileRefManager
and added redirection to threatAssist. Also bug fixed with
redirection threat to unit not in hostile list yet.</pre>




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