Update release notes
Update release notes

Add selected changes from git commit list.
For the full list, see
git log --format=oneline bebe254340b3fbc051780eab132c2703238464e0..HEAD

GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver