Support paste operation on Fonts folder. JIRA issue: CORE-12861 - Add CFontBackgroundMenu.cpp and CFontBackgroundMenu.h to support background menu. - Modify CFontExt::CreateViewObject and CFontExt::GetUIObjectOf methods. - Re-implement foreground menu by using CDefFolderMenu_Create2 and CFontExt::MenuCallBack. - Delete needless CFontMenu.cpp. - Add IDS_PROPERTIES resource string.