functional value parsing

I've fixed a few bugs with value parsing. This means the plugin might produce different values than it has in the past, so I'm tagging this as a 'minor' release

specifically, the plugin:

• no longer strips decimals from numbers (sorry about that)
• no longer strips emoji
• should only strip commas from numbers

I've also added some unit tests around row parsing, so hopefully there are no more surprises there.