Emit Unregistered Mark Warning in Command Line Usage

[mberkowitz03]

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Closes #10514
Emit a warning when -m is used with unregistered marks

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[mberkowitz03]

Sorry - some of the commits are from work on another issue that I accidentally had migrated to this branch. I'd like this PR squashed, anyway.

[mberkowitz03]

I don't love adding arguments to the expression compiler, but I couldn't find a more appropriate way to do it, because of the way command line arguments are parsed. Open to suggestions!