[9715] Implement required basic elements for dual spec learn gossips.

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m src/game/ObjectMgr.cpp

m src/game/ObjectMgr.h

m src/game/Player.cpp

m src/shared/revision_nr.h



[9715] Implement required basic elements for dual spec learn gossips.



Required DB data for real work. This is final part required at core side for support.



Also note that commit include



* generic implementation money cost gossip menu items so let

  implement in DB many money cost gossip operations with _fixed_ cost.

* useful CONDITION_SPELL that let implemtn menu item visible if specific

  spell known/don't known also wide used case for diff gossips.



Signed-off-by: VladimirMangos 

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