Update Build and CI pipeline
* [x] Add commit based change log - similar to TOP
* [x] Add option to flush maven cache
* [x] Add downloadable standalone package
* [x] Consider using maven for assembly instead of bash script? Later...
* [x] The release-cli is deprecated and will soon be removed from GitLab. Need to switch to a more modern approach. See https://docs.gitlab.com/user/project/releases/release_cli/
* [x] Merge to master
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