Use case: a scheduler app that changes the VPN profile according to a schedule, using the existing de.blinkt.openvpn.api.ConnectVPN intent.

Problem: the profile selected via ConnectVPN does not persist across restarts.

Suggested solution: Add a new intent for setting the default VPN. For completeness also add it to the AIDL API. I'm happy to propose a PR if this is a sound approach.

Alternatives:

• I looked at the AIDL API and didn't see an ability to set the default VPN.
• The scheduler app could try to track VPN status and restarts, and call ConnectVPN again if it isn't clear whether the default VPN profile has replaced the program's preferred profile.
• I didn't see any past discussion of this use case in the issues.