Remove per library release notes from release report.

[brianjp93]

• Also delete related per library release notes parsing functions, these functions are specific to the HTML version of the release notes which will be replaced by an adoc version in the near future. If per library release notes are needed in the future, these functions will need to be reimplemented anyway.
• fixes #1470

[brianjp93]

Not too much to review here, just deletions of unused code and html.