CSV as Data Source does not accept " " escaping

[jkwchui]

In CSV files, when content in a field contains a comma , it is escaped by putting the entire field in quotation.

id, category, example
1, animal, dog
2, fruit, "apple, orange, banana"

VectorStyler sees any CSV files with quotes and calls it an error. This prevents using any field with comma as content. I presume this could be circumvented with JSON as the data source but CSV is popular export from spreadsheets.

[VectorStyler]

@jkwchui Seems to be a bug, I will try to fix it for the next build.