New implementation based on `est-eval' and `est-format'.

New implementation based on `est-eval' and `est-format'.
(www-format-value-as-kuten): Abolished.
(www-format-value-default): Abolished.
(www-format-value-as-char-list): Abolished.
(www-format-value-as-domain-list): Abolished.
(www-format-value-as-ids): Abolished.
(www-format-value-as-S-exp): Abolished.
(www-format-value-as-HEX): Abolished.
(www-format-value-as-kangxi-radical): Abolished.
(www-format-value): If `object' is a symbol, it is decoded as
`feature' object.
(www-format-props-to-string): Abolished.
(www-format-apply-value): New implementation; use
`est-eval-apply-value' and `est-format-unit'.
(www-format-eval-feature-value): Abolished.
(www-format-eval-list): New implementation; use `est-eval-list' and
`est-format-unit'.