The absence of SVG files has been addressed by including them,
sourced from the respective FontAwesome versions available for
download at https://fontawesome.com/icons
There is a new API method get_definition_copy() that is expected to
return the definition structure as if the form was written from scratch
via the editor. Such a prepared structure is passed to
a controller's update_definition() method in the new target area.
The same mechanism will be used for copying definitions from a shared
area to a normal gradable area.
