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
 * Blizzard_SocialUI - Twitter integration and in-game screenshot browsing
 * Blizzard_SocialUI - Twitter integration and in-game screenshot browsing
 * Blizzard_SocialUI - Twitter integration and in-game screenshot browsing
 * 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.