Parse and utilize CSV delimiter characters advertised by the data file

[nugget]

The top section of each Road Trip CSV data file contains a block that advertises the file's version, language, and CSV delimiter values. We currently do not parse or utilize the delimiter values embedded in the data file, and instead have hard-coded them in the implementation.

We should be extracting this information from the file and using the supplied characters instead of hard-coded values.

My unconfined guess is that the two characters are the delimiter for CSV parsing, and the decimal delimiter for number values.

Example file header:

ROAD TRIP CSV ",."
Version,Language
1500,en