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

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<pre>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 <vladimir@getmangos.com></pre>



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