(www-uri-decode-feature-name): Decode "o.foo" to `=+>foo'.

(www-uri-decode-feature-name): Decode "o.foo" to `=+>foo'.
(www-uri-encode-feature-name): Encode `=+>foo' to "o.foo".
(www-uri-encode-object): Add `=+>jis-x0208@1978', `=>ucs@iso',
`=>ucs@unicode', `=>ucs@jis', `=>ucs@cns' and `=>ucs@ks' to ccs-list.
(www-format-encode-string): Support "&o-foo;", "&g2-GT-ddddd;" and
"&A-{UU+|U-}hhhh(h)*;".