pub fn split_areas(reference: &str) -> Vec<&str>Expand description
The areas of a reference list, split at the commas between them. A comma inside a quoted
sheet name ('Sales, West'!A1) is part of the name, and a doubled quote inside the quotes
('O''Brien, Jr'!A1) is an escaped quote, not the end of the name: a quote toggles the
quoted state, so a doubled one toggles it twice.