0.17

This release deprecates elementary-xfce-darker, transitions some
monochrome icons back to colored for better legibility in dark/bright
themes, drops lots of legacy symlinks (stock_*, gnome-*) and adds lots
of mimetype icons.

- Deprecate elementary-xfce-darkest
- Add programming language mimetypes
- Add system package mimetypes
- Add lightdm settings, mugshot icons
- Add 24px symbolic icons for Thunar 4.17 toolbar
- Add symbolic view icons for Thunar 4.17 toolbar
- Add missing 96px mimetypes, symlinks
- Add USB Hard Drive, IEEE1394 device icons
- Add firewall icon at all sizes, gufw app symlink
- Update index.theme to match directory tree
- Update some settings/app icons
- Update media playback icons
- Update border/shadow style for common mimetypes
- Update archive action icons
- Update and fix some mimetypes
- Update some app names, symlinks, remove unused
- Update Wifi icons at 48px, remove old
- Update some app names and symlinks, remove unused
- Update find action icon
- Fix symbolic media-skip from being media-seek
- Fix issue where xfsm icons don't show in darker
- Fix blurry software-update icon, update others
- Fix blurry symlink emblem in 0.16 release
- Remove and replace start-here
- Remove gnome- prefixed device icon symlinks
- Remove icon causing cache update error (Fixes #305)
- Remove unused symlinks from actions
- Remove stock icon symlinks from actions
- Remove unused mimetypes
- Remove unused places icons
- Remove unused categories symlinks
- Remove Stock and Tools folders
- Remove redhat, novell icons
- Remove 22px size mimes
- Remove "gnome-" prefixed mimes
- Remove unused, rename misnamed app icons (#273)
- Refresh folder icon emblems
- Refresh a few Xubuntu default app icons
- Make window-close visible in dark and light themes
- Use package mimetype from upsteam
- Rename battery icons, remove legacy battery icons
- Cleanup app icons
- Session icon fixes
- ci: Add GitHub action to test for dangling symlinks