Feature Request: Customize panel grid on first swipe.

[MagneFire]

This idea was suggested on https://twitter.com/kogomat/status/1402933724145201152.

The general concept is that it would allow for customizing a single swipe from the watchface to a custom panel. In other words the notifications/quick settings/calendar/app panel could be replaced/customized to the users' liking.

I think it would be nice if we can for example swap or add more panels to the calendar panel (adds another panel to the right). This can be a set of predefined .qml files or some of the AsteroidOS apps. For example, the music app is a relatively simple single .qml file. We can add a Loader (https://doc.qt.io/qt-5/qml-qtquick-loader.html) that loads this .qml file resulting in the music app being available as a home screen panel.