(mime-lexical-analyze): New function.

(mime-lexical-analyze): New function.
(mime/content-parameter-value-regexp, mime::parameter-regexp): Removed.
(mime-parse-parameter): Ditto.
(mime-decode-parameter-value, mime-decode-parameter-plist,
 mime-parse-alist-to-plist, mime-decode-parameter-alist): New functions.
(mime-parse-parameters-from-list): New alias for `mime-decode-parameter-plist'.
(mime-decode-parameters): New alias for `mime-decode-parameter-alist'.
(mime-parse-parameters): New function.
(mime-disposition-type-regexp): Removed.
(mime-parse-Content-Type, mime-parse-Content-Disposition,
 mime-parse-Content-Transfer-Encoding): New implementation.
(mime-read-Content-Type, mime-read-Content-Disposition,
 mime-read-Content-Transfer-Encoding): Ditto.