merge changes for DRTVWR-152

indra/llui/llnotifications.cpp

indra/llui/llnotifications.h

indra/llui/llnotificationtemplate.h

indra/newview/CMakeLists.txt

indra/newview/llnotificationscripthandler.cpp

indra/newview/lltoastnotifypanel.cpp

indra/newview/lltoastnotifypanel.h

indra/newview/lltoastpanel.cpp

indra/newview/lltoastscriptquestion.cpp

indra/newview/lltoastscriptquestion.h

indra/newview/llviewermessage.cpp

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

...view/skins/default/xui/en/panel_script_question_toast.xml

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