Update sheets with different row/column fields

[benlower]

/cc @DataRoberts

[MikeRobertsPS]

This is a 'nice to have' but not totally needed by everyone. It's great for automating template workbooks for new hires, etc. For example, if you have a date column, measure then you can read the data and automate creating a 'peek' at the data. Here's an example of pulling all that metadata: https://github.com/DataRoberts/Tableau/blob/master/TableauDesktop/TsTwbInternals.ps1