Icon naming guidelines for Xfce 4.14

This page is still a work-in-progress and currently not much more than a collection of notes!

adwaita-icon-theme still mostly follows the (unmaintained, dead) freedesktop.org Icon Naming Spec, especially contexts are dead
Gtk Stock item guidance: https://developer.gnome.org/gtk3/stable/gtk3-Stock-Items.html
Gtk3.14 provides a gtk3-icon-browser that helps with updating icon names, be it that they are xfce-specific or that they were GTK_STOCK icons
Gnome has some rough icon guidelines for app developers