Update RELEASE_NOTES for V1.11 Release
Update RELEASE_NOTES for V1.11 Release

Added selected headlines since last update:
git log --format=oneline eaad592ae6a70e491c51606c27885824495b925c..HEAD

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