feat: CVT QCDDAT ML Sub-package

[c-dilks]

PR opened on behalf of @zieglerv

Redux of CVT_QCDDAT branch, since

• keep @zieglerv's original branch as is
• branch urwt_detector-change-hook is based off of CVT_QCDDAT

[c-dilks]

Hmm.. Look's like Veronique's commits are authored by ziegler (which GitHub thinks is an unknown user), not @zieglerv; anyway, it's clear these are both Veronique, but we should make sure @zieglerv is attributed when we merge this (otherwise it may erroneously look like I did all this work, when all I've done so far was rebase!)

[zieglerv]

Sorry I committed them from my personal Mac that is why the author name is different