EXP-1247 Nearby chat as part of chat floater

indra/llui/llresizehandle.cpp

indra/llui/llresizehandle.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