Taskbar tray icon spacing v1.1:

* Renamed from "Taskbar notification icon spacing" to "Taskbar tray icon spacing", as tray is the more familiar term.
* Added support for more system icons, including the chevron icon, microphone, keyboard, language, and others.
* Added two options to customize the tray overflow: "Tray overflow icon width" and "Tray overflow icons per row".