[9121] Implement dummy effects for spell 50926,51026,51592 and 51961

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<pre>m sql/mangos.sql
+ sql/updates/9121_01_mangos_npc_spellclick_spells.sql
m sql/updates/Makefile.am
m src/game/SpellEffects.cpp
m src/shared/revision_nr.h
m src/shared/revision_sql.h

[9121] Implement dummy effects for spell 50926,51026,51592 and 51961

Note: Some adjustments in addition to original patch, using delay despawn.
Also provide sql update for proper work of affected spells (if already exist in database).

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



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