Moves to calling refreshEnabledState directly from LLPanelDisplay instead of bouncing around in LLFloaterPreferences first or using static proxy functions
Cleans up unused cached button pointers and old style static callbacks.
Conflicts:
indra/newview/llfloateractivespeakers.h - llparticipantlist.h got changed from a panel to a layoutpanel
indra/newview/lloverlaybar.cpp - Silly conflict, I change one line, Shyotl changes the next two.
Compile fixies:
indra/newview/llavataractions.cpp needed to include llnotifications.h
indra/newview/llvoicechannel.cpp needed to include llnotifications.h
