- Update to support build with Java 17
  - We will continue compling with Java 11
  - We support the two latest LTS versions 11 and 17
- Update versions of build plugins
- Align p2 pom.xml to currently used targetplatform repo
- Remove includePackedArtifacts option in target-platform-configuration plugin as this is not compatible with Java versions > 14

Resolves #211

- Retrieve newer test dependencies from 2022-12 orbit and consume missing via org.eclipse.emfcloud.modelserver.tests bundle
  - Add hamcrest dependency libs to tests bundle, as there is otherwise a plugin clash as junit consumes the former 1.3 version
- Introduce MockitoUtil that replaces Mockito's internal 'FieldSetter' class (which was removed with the newer version)

- Update GitHub action build workflow to build with Java 17
- Jenkins still builds with java 11 (so we publish also the jar built with 11 to avoid any possible backwards compatibility issues)