ShellApp: Add method to activate an action via FDO DBus activation
There are multiple different places where we activate an app action,
but none set the correct activation token. Therefore this adds an async
method to to call ActivateAction
on org.freedesktop.Appliaction
with the correct activation token/startup id as platform data.
Closes partially: #358 (closed)
Closes: #7409 (closed)
Edited by Julian Sparber