Add cut/copy/paste to Cinnamon menu editor fix merged menu integration

There is a bit of special handling for Wine programs, as they don't behave properly when trying to delete or move their entries.

Added cinnamon-applications-merged symbolic links to the appropriate folders - according to freedesktop menu specification, we had our merged directory names wrong.  We need to keep them applications-merged for compatibility, but it was actually looking for cinnamon-applications-merged, since our menu file is cinnamon-applications.menu.

Hopefully this fixes programs showing up in the Other category when they should show up elsewhere instead.

See #1574