Tests: add support for grid unit

Signed-off-by: Simon Busch <morphis@gravedo.de>
Remove dashboad implementation

Signed-off-by: Simon Busch <morphis@gravedo.de>
Separated visual and helper items within CardShell

Signed-off-by: Simon Busch <morphis@gravedo.de>
Prototype of new notification area / system menu

Signed-off-by: Simon Busch <morphis@gravedo.de>