Stand-alone property estimator

[rwest]

A stand-alone script to estimate thermochemical and transport (and solvation) properties would be helpful. I think there is one to estimate reactions; we could consider one script to do both. This should be documented, and have examples.

For now, people can use the website http://rmg.mit.edu/molecule_search (but that doesn't give chemkin formatted data) or make an input file with all the species marked as reactive=False (perhaps this is all we need?! in which case just some instructions)

[github-actions]

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