[8930] Implement bonus periodic heal part for spell 19750 and ranks.
 

<pre>m sql/mangos.sql
+ sql/updates/8930_01_mangos_spell_proc_event.sql
m sql/updates/Makefile.am
m src/game/Unit.cpp
m src/shared/revision_nr.h
m src/shared/revision_sql.h

[8930] Implement bonus periodic heal part for spell 19750 and ranks.

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

Also code ordering and cleanups.</pre>



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