Encode OpenVPN password + OTP in tunnel rather than in the app.
Encoding them upfront in the app ends up persisting the profile with the
combined password. Update the library with a new OTP field in
OpenVPN.Credentials, so that the password encoding is performed [on the
fly in the
tunnel](https://github.com/passepartoutvpn/passepartoutkit-source/pull/398).
Similar to how provider modules are generated.
This is likely a regression caused by migrating to NEProfileRepository,
because starting a connection causes the profile to be saved to NE with
the encoded password. Later, the profile is restored from NE and
therefore contains the encoded password.
- Let the user close the window, the app will just remain alive in the
status bar
- Accordingly, replace "Confirm quit" preference with the option to stay
alive in the status bar
- Add "About..." item
Split AppUI into AppUI and AppUIMain to allow for a new, simplified
AppUITV target tailored for the Apple TV.
As a PoC, present a view with a list of the shared profiles.
