* Move and rename `degimpify.sh` script to make it easier to find and use the `degimpify` script.
* Make `degimpify.sh` script use `sed` in place.
* Make `degimpify.sh` script use default directories if none are provided.
* Make `degimpify.sh` script support processing all XPM (Pixmap) files in multiple directories.
Signed-off-by: Emily Mabrey <emabrey@tenacityaudio.org>
Reference-to: https://github.com/tenacityteam/tenacity/pull/407