Allow making server desktop/start menu/taskbar shortcuts

[blattersturm]

While reviewing the jump list work (and having forgotten that this existed entirely), it seemed like it might be workable to allow servers to get a shortcut added to the Start menu so they can eventually pin to Start, the taskbar or the desktop.

Requirements:

• Only do this on user request i.e. from main UI, potentially just on favorite.
• Properly add or remove icons (e.g. on favorite?) to a Start menu folder, similar to browser PWAs.
• Optionally add to desktop: prompt the user.
• Gracefully handle icons being removed from the shell (and servers failing to exist i.e. orphans?)

Inspiration: browser favorite UI popover?

'undo' button, potentially a 'don't add to Start'/'add to Desktop' tick

[blattersturm]

Any implementation of this should probably build on and extend the shell link functionality from the jump lists.