Update/Modernize LLAvatarName and LLAvatarNameCache and _EVERYTHING_ they touch
Fairly certain this adds the feature in which the user may click the online notification to open a chat with the user coming online. Translators may want to look at the xml changes of this change to see what to update Removes old LegacyMultiAttachmentSupport patch Moves LLAvatarName-centric functions into LLAvatarName from elsewhere. Adds boost::signals2::connections to name polling places. Removes more old icky static callbacks Merge from Alchemy, credit where due~ Update notifications.xml to have a bunch of the tags from upstream to ease diffing
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