EXT-7644 FIXED Implemented functionality for locking outfit modification...

EXT-7644 FIXED Implemented functionality for locking outfit modification controls and used it for 'save outfit' action.
1 Added functionality for locking outfit in LLAppearanceMgr. Outfit should be locked when outfit related operation is started(now it is used for updateBaseOutfit) and unlocked when operation completed or timeout is exceeded.
2 Added outfit saved and outfit lock changed signals to LLOutfitObserver.
3 Updated LLPanelOutfitsInventory and LLPanelOutfitEdit with functionality of controlling 'save outfit' controls state('save outfit' controls should be enabled only if outfit isn't locked and outfit is dirty).
4 Renamed action label of method LLPanelOutfitsInventory::isActionEnabled "make_outfit" to "save_outfit".

--HG--
branch : product-engine