Preferences->Adv. Chat->Chat UI, Autoscroll to the end of chats when they regain focus.
This defaults to false, unlike the legacy behavior.
Partial revert of "Feature Removal!: Do not scroll to the end of chats when the corresponding chatbar regains focus!"
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.
Instead of focusing the chat bar when the chat history floater is visible, focus it onFocusReceived
This avoids the floater grabbing focus when returning from mouselook.
