public HashTable<string,string> header_parse_semi_param_list (string header)
Parses a header which is a semicolon-delimited list of something like: token [ "=" ( token | quoted-string ) ].
Tokens that don't have an associated value will still be added to the resulting hash table, but with a
This also handles RFC5987 encoding (which in HTTP is mostly used for giving UTF8-encoded filenames in the Content-Disposition header).
a header value