CHUI-119 WIP Prepare the nearby chat for hosting it by the IM-container

indra/llui/llfloater.cpp

indra/llui/llfloater.h

indra/llui/llview.cpp

indra/newview/CMakeLists.txt

indra/newview/llfloaterpreference.cpp

indra/newview/llimconversation.cpp

indra/newview/llimconversation.h

indra/newview/llimfloater.cpp

indra/newview/llimfloater.h

indra/newview/llimfloatercontainer.cpp

indra/newview/llimview.cpp

indra/newview/llnearbychat.cpp

indra/newview/llnearbychat.h

indra/newview/llnearbychatbar.cpp

indra/newview/llnearbychatbar.h

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

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