Core/Calendar: Fix memory leak when malformed CMSG_CALENDAR_ADD_EVENT is received
Core/Calendar: Fix memory leak when guild announcement is created
Core/Items: Fixed swapping equipment sets in combat
Merge pull request #11462 from Dehravor/add-event-memleaks

Core/Calendar: Fix memory leaks due to BytebufferException thrown
Core/Calendar: Add documentation regarding fix in previous commit
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb
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