Add support for Azure DevOps url scheme

[friggog]

Would be nice to have support for URL links when hosting code on Azure DevOps

They are of the form:
https://dev.azure.com/ORG/TEAM/_git/REPO?path={path}&version={commit}&line={line_low}&lineEnd={line_high}&lineStartColumn=1&lineEndColumn=1&lineStyle=plain

The {line} one is easy: https://dev.azure.com/ORG/TEAM/_git/REPO?path={path}&version={commit}{line}&lineStartColumn=1&lineEndColumn=1&lineStyle=plain with LineRangeFormatting("&line=", "&lineEnd=")

The commit is a bit harder... ADO annoyingly prefixes the hash with "GC" or a branch name with "GB" - so this would need a special check.

I can take a crack at doing a PR for this if that would be helpful?