[Voice Update] LLVoiceClient

Migrate a bunch of classes out of llvoiceclient.* and into new llvoicevivox.*
Update most of these to match their counterparts
Introduce VoiceFonts support (voice morphing, floater still to come)
Support for a bunch of v3 voice settings.
Move volume settings management from LLMutelist into LLSpeakerVolumeStorage
Support for Avaline mutes (WIP)
Adds voice section to LLAgent
Moved llfloatervoicedevicesettings to llpanelvoicedevicesettings, v3's voice device panel design is more intuitive.

indra/newview/llimview.cpp

@@ -1720,7 +1720,7 @@ public:
 				return;
 			}
 
-			if(!LLVoiceClient::voiceEnabled())
+			if(!LLVoiceClient::getInstance()->voiceEnabled())
 			{
 				// Don't display voice invites unless the user has voice enabled.
 				return;