New Changes:
New / updated icons:
- C / C++ header and source mimetypes
- QEMU mimetype
- GNOME Calendar
- GNOME Cheese / Snapshot
- GNOME Decoder
- GNOME Files symbolic icon
- Pika Backup
- Yelp
- Miscellaneous symbolic status icons
Project / structure changes:
- Updated GitHub workflow actions
- Documented font conventions