(www-format-encode-string):

- Add entity-reference setting for `==cbeta'.
- Display "&R-CBddddd;".
- Display "&g2-iddd+hhhh;".
- Fix alt property of img tag for "&CDP-iddd-hhhh;".
- Display "&g2-U-vddd+hhhh;".
(coded-charset-GlyphWiki-id-alist): Add settings for
`==ucs-itaiji-005' and `=>>adobe-japan1-{0..6}'.