[7798] More Player::ActivateTaxiPathTo use improvements Author: VladimirMangos

* Provide more explicit way about spell that cast taxi flight if any
    * Remove incorrect states instead error reporting in case non-taximaster flight start (cast/script)
    * Remove mount_id arg from ActivateTaxiPathTo and implement support for 0 mount_id case (spell 32474)
    * Implement spell 32474 (except finilize part)
    * Provided Player::ActivateTaxiPathTo(uint32 taxi_path_id) function version for simplify one node to node paths use by id.

--HG--
branch : trunk

src/game/SpellAuras.h

@@ -217,6 +217,7 @@ class TRINITY_DLL_SPEC AuraEffect
         void HandlePeriodicTriggerSpellWithValue(bool apply, bool Real);
         void HandlePeriodicEnergize(bool Apply, bool Real);
         void HandleAuraModResistanceExclusive(bool Apply, bool Real);
+        void HandleAuraSafeFall(bool Apply, bool Real);
         void HandleAuraModPetTalentsPoints(bool Apply, bool Real);
         void HandleModStealth(bool Apply, bool Real);
         void HandleInvisibility(bool Apply, bool Real);