[9914] Add script effect of spell 51864, 51889 and 51910

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<pre>m src/game/SpellAuras.cpp
m src/game/SpellEffects.cpp
m src/shared/revision_nr.h

[9914] Add script effect of spell 51864, 51889 and 51910

In addition, dummy effect of spell 51866 and 51872 and dummy aura effect of
spell 51870.
Dummy effect of 51866 might need additional work (see comments).

Code expect additional spell cast by AI (summon dummy at death of related quest
target creatures).

Signed-off-by: NoFantasy <nofantasy@nf.no></pre>



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