feat: Allow for spaces and commas in string-valued options.

[JeffFaer]

The syntax now allows you to surround string-valued options in quotes so that you can include spaces: ignore_prefixes="* ,* ["

To include a quote, comma, or backslash, you can escape those characters with a backslash: ignore_prefixes="* ,\" ,\, ,\\ " would ignore the following prefixes:

• *
• "
• ,
• \

Fix #28