Support for VimL quotes about pear-tree HOT 1 CLOSED

I've been a little hesitant to fix this because I'm not crazy about having filetype-specific criteria in the main pairing functions. However, I think Vim's unfortunate comment prefix makes this necessary. Right now I think I will make it so that " is matched unless:

1. The cursor is on an empty line, or

2. The cursor follows more than one whitespace character.

This would handle end-of-line comments so long as the user precedes them with multiple spaces, and would still auto-pair " for most cases where it is intended as a string delimiter.

I've also considered simply disabling " matching in Vim files entirely via a ftplugin, but this might not be ideal from a user perspective. Feedback is welcome.

from pear-tree.