Cinnamon Menu Editor (aka alacarte) incorporated in Cinnamon Settings

Menu item in Cinnamon Settings now contains alacarte in "advanced" mode.
Menu context menu open only Cinnamon Settings -> Menu.
Alacarte continues to operate in stand alone mode via bash.
cinnamon-menu-editor1.ui is the Gtk.Builder file for new Cinnamon Setting iter.
cinnamon-menu-editor.ui only works for stand alone program. You can delete it?

Sorry if I made any mistakes. This is my first pull request.
-- 
Giorgio