Fix md_inline_extension compatibility errors with Markdown >= 3.4 #1374
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etree import has been deprecated since Markdown 3.2 https://python-markdown.github.io/change_log/release-3.2/#markdownutiletree-deprecated
md_globals not passed anymore in extendMarkdown
Registry.add deprecated and replaced with Registry.register
Tries to fix #1373, but there are still more errors lurking!