[TW278] - Core/Scripts: Prevent multiple spawns of Ulag

http://www.wowhead.com/quest=1819/ulag-the-cleaver
Scripts/Commands: Ensure gameobject template is valid from .gob add temp [...]

As per Aokrome's spamming. "Avoids false positive logs"
DB/Item: Fix Essence of the Pure Flame scaling

By gecko32, closes #1925
Core/Spells: Fixed players being able to mount with all transform auras

Closes #11852
Scripts/Commands: Fix .mmap loc wrong coordinates

Fix .mmap loc command printing swapped x and y tile coordinates
Scripts/Commands: ".modify speed" targets current Player by default

Allow ".modify speed" command to target current Player if there is no target or if the selected Unit is a Creature.
This behavior could be extended to other commands that require target Players.
Scripts/Commands: Fix memory leak in ".gobject add" command

Valgrind log:
 158 (104 direct, 54 indirect) bytes in 1 blocks are definitely lost in loss record 24 of 73
 at operator new(unsigned long) (vg_replace_malloc.c:319)
 by GameObjectModel::Create(GameObject const&) (GameObjectModel.cpp:152)
 by GameObject::Create(unsigned int, unsigned int, Map*, unsigned int, float, float, float, float, float, float, float, float, unsigned int, GOState, unsigned int) (GameObject.cpp:237)
 by gobject_commandscript::HandleGameObjectAddCommand(ChatHandler*, char const*) (cs_gobject.cpp:155)
Scripts/Commands: Add comment about 9d5841073971c7f55cf621da3a31b38656618582 changes
DB/CreatureText: Started the conversion to the BroadcastText system
Fix crash in Magister's Terrace

Fix Unsealed Chest quests
Fix Sylvanas Musicbox :)
Merge branch 'master' of git://github.com/TrinityCore/TrinityCore