Use HTTPS for action URLs

• Change default actions use https: for remote action "calls" instead of insecure/plaintext http: URLs.
• Change the Long URL action regex to accept https: URLs.

This commit does not improve the Image action regex, which is (by default) executed locally and should match https: as-is.

See

• https://bugzilla.xfce.org/show_bug.cgi?id=1
  • Note that the XFCE Bugzilla was replaced with XFCE Gitlab in May 2020.
  • https://gitlab.xfce.org/
• https://tinyurl.com/create.php?url=https://en.wikipedia.org/wiki/TinyURL
  • https://tinyurl.com/preview/dyynf56
  • https://tinyurl.com/dyynf56