I've created a copy of the current systemtray applet in order to do a lot of refactoring.
I won't add change the CMake files to have it built/installed until it actually does something more than the current system tray.

The goals of this refactoring are to allow for an easy integration of a new system tray spec, making the current feature requests on bko doable and to actually implement those feature requests.

This codebase will quickly become different from the current system tray so i'll fix any bugs locally that are fixed in the main system tray applet as necessary.