Xml Formatter 0.4.0

Users

• Rewrote comment handler to prevent #164
• Add proper logger (slf4j) instead of using system out. Slf4j is already part of its intended usage via Maven
• Use assert to check for spots that are known not to be null as scanners cannot follow code well.
• Make sure we are closing the xml reader as it was possible to leak.
• Refactor some of the code.
• Misc code cleanup

Build

• Using new parent pom for revelc. Note to releases: Skip sortpom and formatter to release as it does not handle windows properly. Issue raised upstream.
• Run GHA on java 21 as well as well as re-enable it for contributors branches