[10475] Implement SPELL_AURA_HEAL_ABSORB (301)

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<pre>m src/game/Level3.cpp
m src/game/Player.cpp
m src/game/Spell.cpp
m src/game/SpellAuraDefines.h
m src/game/SpellAuras.cpp
m src/game/SpellEffects.cpp
m src/game/Unit.cpp
m src/game/Unit.h
m src/shared/revision_nr.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10475] Implement SPELL_AURA_HEAL_ABSORB (301)

Used for example in spells 66237 and 70659.

Also rename CalculateAbsorbAndResist -> CalculateDamageAbsorbAndResist</pre>




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