Add opton to make Status Notifiers appear left of Systray Icons

The Status Tray Plugin has two categories of icons, Status Notifiers and Systray Icons.

While order of icons can be configured within each category, there is apparently no option to change the order of which category appears first.

This is mildly annoying because Status Notifiers, content of which regularly changes, appear to the right of Systray Icons, which mostly stay the same all the time.

So for those of us who have the Status Tray Plugin on the right side of the panel, new icons shift the position of the constantly present icons. If positions of categories would be switched, then always present icons would stay in the same position while new icons would appear in what was previously unused space.