Use quoted_split() in _parse_type_rule().
Allow alternate quotes in quoted_split()

_parse_type_rule() allows for both ' and ", while HTTP headers only
need allow for ".  Update quoted_split() so we can specify the quote
characters to worry about.
Add parameters to type rules

This allows parameters to be added to type rules.  These parameters
are ignored by AVersion, but are included in the 'aversion.config'
WSGI environment variable, and can be used by the application.