Updated spreadsheet, added sheet for variable mapping

This greatly simplified the process of copy/pasting variables/info to
the script. I added comments to the file, so have a look if you want to
see how I did it.
Fixed some functional bugs

Mostly related to typos and other simple mistakes
Now creating barebones family SNAP cases

It's successfully updating SIBL/PARE/EATS/WREG/ABPS. I've also added all
of the variables it needs to scan from the spreadsheet. It's coming
along.