Patch 4.1.0/API changes

Breaking changes

 * COMBAT_LOG_EVENT and COMBAT_LOG_EVENT_UNFILTERED have a new third parameter, hideCaster.
 * Addons are now required to register the prefixes they want to receive messages for using.

API changes

 * REMOVED / ; worgen transformation is now treated entirely as a spell.
 * REMOVED along with actual pet happiness.
 * REMOVED
 * NEW calendar extensions
 * NEW Looking For Guild / Guild Recruitment API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking For Guild / Guild Recruitment API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Looking for Group Call To Arms (role shortage) API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Guild Challenges API
 * NEW Opt-in Addon Communication API
 * NEW Opt-in Addon Communication API
 * NEW Opt-in Addon Communication API
 * NEW Opt-in Addon Communication API


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Event changes

 * COMBAT_LOG_EVENT and COMBAT_LOG_EVENT_UNFILTERED have a new third parameter, shifting existing parameters to the right.
 * REMOVED END_REFUND, items no longer become untradable due to enchanting, etc.
 * REMOVED HONOR_CURRENCY_UPDATE, honor now treated as ordinary currency
 * REMOVED INSPECT_TALENT_READY, talent information available by default.
 * REMOVED KNOWN_CURRENCY_TYPES_UPDATE