Update to 18.9.0, new maintainer: kikadf.01@gmail.com

Details:

• Update to upstream release 18.9.0
• New maintainer: kikadf.01@gmail.com
• Move to QT5 as default UI

While on it:

• Pet portlint
• Fix warning in check-sanity: Add gl to QT5_USES

PR: 231855
Submitted by: kikadf.01@gmail.com (new maintainer)