Add an example AppData file for musique
trivial: Fix the left padding when extracting <p>
Add an example AppData file for pdfshuffler
Add an example AppData file for stellarium
Add an example AppData file for gnome-sudoko
Use regular expressions to remove spaces
Add AppData files from upstream while we wait for a new release
Add an example AppData file for hotot-gtk
Always write UTF-8 descriptions
Download other common packages for icons that are not stored in the base package

This fixes transmission-gtk and libreoffice.
Add an example AppData file for sol