- fix XMLElementXpathFilter over multiple xpath elements (thanks
  Julian Wundrak and Harm van Tilborg)
- fix XMLChildElementIterator with named child elements
- fix missing NULL return on XMLReaderIterator::current()
- build: test/developbranches in github action workflow
- build: gist doc-comment url
- build: error on uncomitted changes
- add XMLElementXpathFilter regression test
- add XMLChildElementIterator regression test
- add XMLChildElementIterator test for getNodePath()

Co-authored-by: Julian Wundrak <j.wundrak@dotsource.de>