Allow more personalization of system tray icons

[Leccho]

This feature request is to allow users to have more control of their system tray icons.

Here are the features which I think should be added:

1. Allow to reordering the icons
2. Allow to stacking the icons (regroup them into one icon like an arrow or ...)
3. Save all configurations made above

Note: There should be the possibility to use the current icon tray as well as the stackable icon together.

I found Tray Icons: Reloaded in the gnome extensions as an example. Sadly could not get it to work. It seems to be interfering with ZorinOS AppIndicators (even after turning off this one and restarting the pc).