Patch 6.1.0/API changes

==New==
* New Blizzard addons
:* Blizzard_Collections - Blizzard_MountJournal + Blizzard_PetJournal + Blizzard_ToyBox + the new heirlooms UI
:* Blizzard_DeathRecap - Watches combat log to see what killed you and inform you of this
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:* Blizzard_SocialUI - Twitter integration and in-game screenshot browsing
==Changes==
* Currently, all TGA/PNG loading by addons is broken and will cause the game to exit.
* SendChatMessage() no longer accepts non-UTF8 characters.
==Automated diff==