Start menu shortcuts need more attention, they go stale

[Antoine Martin]

We can remove existing commands during the applet's lifetime but the shortcuts do not currently get deleted. We need to replace the current lambda delete callback with a generic callback like ServerCommand?.remove() so we can call it from timeout.

Some of the shortcuts may just be invalid, we should pass them to a wrapper than can delete them if the applet replies it's invalid?

We may also want to remove them when we disconnect from a server? Make it an option?
Start the applet on demand?...