Minor updates to code, mostly just a migration with some v3 stuff commented, since we don't have LLAvatarList and must use buttons since scrolllist menus don't actually exist nicely yet.
Added toggleMuteVoice and isVoiceMuted to LLAvatarActions
Added a minor touch to the voice volume slider, it'll now offer changing your own volume while in an active voice session.. nice to not drop out of an import voice session just to fix yourself.
Also, fix a bug with SpeakerMgr's not flagging speakers for removal properly, causing external speakers and speakers managed by LLActiveSpeakerMgr to never actually get removed.
Condenses the three moderation responders to one.
Adds Speakers settings.
Uses dedicated timer class to track speakers on the list
Adds temporary getSpeakerManager() function to LLFloaterIMPanel to play the role of LLIMModel::getSpeakerManager
