Add placeholder for desuperheater with water-to-air variable speed equation fit coil

[yzhou601]

Pull request overview

• Fixes #ISSUENUMBERHERE

Description of the purpose of this PR

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[Myoldmopar]

This can go in, no problem. It's tagged as a NewFeature labeled PR, but really it's not a new feature. When you make the actual implementation PR, let's tag that one NewFeature and try to remember to move this to DoNotPublish. Anyway, this is good, thanks.