csv_bv: Retrieve data from CSV files (Ms Excel too)

This class can be used to parse and retrieve data from CSV files either in the standard or MS Excel format.

Two methods are provided to either process the file a line at a time or return the whole csv file as an array

It can:

- Handle line breaks within quoted fields
- Support different character separator (usually a comma or semicolon) in quoted fields
- Optionally remove leading and trailing white spaces and tabs
- Optionally skip empty rows
- Support Windows and Unix line breaks (care must be taken with Macintosh format)
- Remove escape characters