[Voice Update] llfloateractivespeakers.* to llspeakers.*

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

indra/newview/llpanelvoicedevicesettings.cpp

@@ -129,7 +129,7 @@ void LLPanelVoiceDeviceSettings::draw()
 				}
 				else
 				{
-					color = gSavedSettings.getColor4("FocusBackgroundColor");
+					color = LLUI::sColorsGroup->getColor("FocusBackgroundColor");
 				}
 
 				LLRect color_rect = bar_view->getRect();