Always strip quoted ' ' and '\t' when stripquoted=true

[nickrobinson251]

• closes stripquoted doesn't know to strip quoted whitespace when space is the delimiter #115 (see issue for details)
• ...but i'm not sure if hardcoding ' ' and '\t' as whitespace (when in quotes) is a great idea
  • we do hardcode '\n' and '\r' as newline chars, which seems fairly analogous
  • but we do expose wh1 and wh2 for whitespace
• an alternative is to expose qwh1, qwh2 keywords for setting "chars to be considered leading/trailing whitespace in quoted strings", but it'd only be used in this one use-case, so i'm inclined to think we can wait til it's requested

[quinnj]

Ok, spent a little time noodling on this and I think I'm coming to the same conclusion: hard code for now, maybe have qwh1/qwh2 in the future. Let me noodle on it just a bit more, but I think this is probably good.