Add "breaking changes" list to major versions and major commits

[pawamoy]

Major versions and major commits should dispose of their breaking changes as a list.

These breaking changes list could be parsed from the commits messages:

Subject...

Body...

BREAKING CHANGES: (adapt the regex to support similar wording) 

explanation, code, etc.

--- (end of the breaking changes)

Footer, or other section...

Otherwise we could simply concatenate the bodies of the major commits for each major version.

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