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

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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.

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