[10207] Implement ITEM_FLAGS2_EXT_COST_REQUIRES_GOLD use instead sign of ExtendedCost field.

[newsbot]

<pre>m sql/mangos.sql
+ sql/updates/10207_01_mangos_npc_vendor.sql
m sql/updates/Makefile.am
m src/game/Creature.cpp
m src/game/Creature.h
m src/game/ItemHandler.cpp
m src/game/ItemPrototype.h
m src/game/Level2.cpp
m src/game/ObjectMgr.cpp
m src/game/ObjectMgr.h
m src/game/Player.cpp
m src/shared/revision_nr.h
m src/shared/revision_sql.h

[10207] Implement ITEM_FLAGS2_EXT_COST_REQUIRES_GOLD use instead sign of
ExtendedCost field.</pre>



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