[10660] Make quest for game event be independent of source

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<pre>m sql/mangos.sql
+ sql/updates/10660_01_mangos_game_event_quest.sql
m sql/updates/Makefile.am
m src/game/GameEventMgr.cpp
m src/game/GameEventMgr.h
m src/game/Player.cpp
m src/game/QuestDef.cpp
m src/game/QuestDef.h
m src/game/QuestHandler.cpp
m src/game/World.cpp
m src/shared/revision_nr.h
m src/shared/revision_sql.h
</pre>
<pre style='white-space:pre-wrap;width:81ex'>[10660] Make quest for game event be independent of source

Create new table and convert existing data.
Simplify how game event quests are activated during event by adding generic function to set quest active/inactive.
Any quest in game_event_quest are disabled until event start (and deactivated once stopped)

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




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