Release Version 4.0.0
Blocked by issues:
- #225 (closed)
- #222
- #221 (closed)
- #220 (closed)
- #219 (closed)
- #215 (closed)
- #212 (closed)
- #11 (closed)
On the day of release:
- remove deprecated branches in repository
- ensure Changelog is up to date
- update VERSION file
- create release commit and tag it (update its description in gitlab!)