EXP-1202 : pull from richard/viewer-experience-fui

indra/llui/llbutton.cpp

indra/llui/llbutton.h

indra/llui/llpanel.h

indra/llui/llresizehandle.cpp

indra/llui/llresizehandle.h

indra/llui/lltoolbar.cpp

indra/llui/llview.h

indra/newview/llchatbar.cpp

indra/newview/llimview.cpp

indra/newview/llnearbychat.cpp

indra/newview/llnearbychat.h

indra/newview/llnearbychatbar.cpp

indra/newview/llnearbychatbar.h

indra/newview/llnearbychathandler.cpp

indra/newview/llnotificationhandlerutil.cpp

indra/newview/llnotificationtiphandler.cpp

indra/newview/llviewerfloaterreg.cpp

indra/newview/llviewermessage.cpp

indra/newview/skins/default/xui/en/floater_chat_bar.xml

indra/newview/skins/default/xui/en/panel_nearby_chat.xml