GUI: Ensure navigation toolbar filtering does not go out-of-sync

Merge branch 'pmui-navbar'

README: Update IDE instructions for JDK21

Pom: fix jogamp dependencies/updates

See #212 (comment)

TWS: Patch Loader command for better handling of 4D images

[maven-release-plugin] prepare release SNT-4.2.1

[maven-release-plugin] prepare release SNT-4.2.0

[maven-release-plugin] prepare release SNT-4.1.21

[maven-release-plugin] prepare release SNT-4.1.20

[maven-release-plugin] prepare release SNT-4.1.19