Log Message:
elementary-xfce-icon-theme: update to 0.19

Upstream change log:

This release cleans up obsolete icons and refreshes many others. Many
thanks to @newhoa for prepping this release for Xubuntu 24.04 (and
everybody else using this theme)!

    Places: Use colorful "pictures" folder icon (#436)
    Apps: New Settings Manager icon (#438)
    Apps: New Xfburn icon (#439)
    Actions: Update more disc-based icons
    Devices: Update audio and data disc icons
    Mimes: Use 'applications-other' for executables
    Actions: Colorize send, clear, update some borders
    Apps: Update software-properties icon
    Apps: New icon for Ubiquity (Xubuntu Installer)
    Apps: New Mousepad, Appfinder icons
    Apps: Add Snap Store app icon (from Yaru)
    Apps: Add Xfce panel plugins, various fixes
    Apps: Remove Chrome webapps
    Status: Add update-notifier icon
    Actions: Update session icons
    Animations: Add 16px connecting, symbolic folder
    Devices: Fix incorrectly sized USB icon at 22px
    Status: New Wifi size for non-symbolic 16px icons
    Apps: Remove symlinks which are no longer needed
    Apps: Refresh system monitor / task manager icon
    Apps: Add qBittorrent, refresh Dictionary
    Apps: Add mpv, update and refresh others
    Mimes: Grid-align office icons
    Status: Make symbolic wifi icon larger
    Fix non-matching open-menu icon at 16px
    Move notification app icon to categories
    Status: Make symbolic audio icons bigger
    Animations: Add VPN "connecting" icons at 16px
    Mimes: Add Cue, deja vu, lossless audio
    Apps: Add Calculator, Element, refresh others
    Update 22px Places and Actions
    Remove old Xfce icons
    Do not convert 'symbolic-rtl' versions.
    Apps: Remove (most likely) unused symlinks
    Categories: Add education, refresh other icon
    Apps: Use bell style for notification app
    Actions: Make zoom icons uniform, add contrast
    Status: Update bluetooth, blueman icons
    Apps: Remove more unused symlinks
    Mimes: Some new, update others to match upstream
    Update AUTHORS
    Apps: Remove Thunderbird, Midori, pdfshuffler
    Apps: Remove unused
    Adjust .svg files from 755 to 644 (#395)