Is your feature request related to a problem? Please describe.

Permissions Policy, W3C Working Draft, 16 July 2020 specifies that Feature-Policy is now called Permissions Policy.

If Nextcloud implements these headers they should be kept up to date.

Describe the solution you'd like

At

Permissions-Policy should be generated instead of Feature-Policy.
Permissions-Policy has slightly different syntax.

Describe alternatives you've considered

Both Permissions-Policy and Feature-Policy are generated.

Additional context

securityheaders.com post on the topic - Goodbye Feature Policy and hello Permissions Policy!

Thanks!