Rename Duplicate Range action to Duplicate and assign existing Alt+d key binding

Rename Duplicate Range action to Duplicate and assign existing Alt+d key binding

This will work the same as the existing binding with a Region Selection and
will also duplicate ranges in range selection mode.

Also add multi-duplicate editor action and use that for the default
multi-duplicate action, which will work the same in Object Selection/Grab Mode
but also supports Multi Duplicate of Range Selections....well it would if
that functionality worked correctly.

The duplicate and duplicate-multi region actions still have to exist to be used
in the Region menu as they should only be sensitive if there is a Region
selection which would not be the case if the editor actions were used.

Resolves: #7153