Xfce 4.16 new naming scheme

The names of icons in Xfce 4.16 have changed, so please utilize the script to simplify the necessary old name to new name conversion.

https://gist.github.com/bluesabre/582d886a02c793285f4e3081df9b2a3c

https://wiki.xfce.org/releng/4.16/icons_rdns_naming_for_icons

Start by reviewing the icon naming conversion script in the linked Gist and the Xfce 4.16 naming guidance in the linked wiki page. Inspect the repository’s existing icon names, then use the script to convert the old names; done means the theme follows the new naming scheme.

Written by the indexing model from the issue text.