(U+53F0): Add some relations for other characters.

(U+53F0): Add some relations for other characters.
(U+830D): Use `<-denotational@component' instead of `<-denotational'
for A-J0-6771; add `ideographic-structure'; add representative nodes.
(U-00020DCE): Apply new conventions for glyph granularity.
(U+20DCE-var-002): New character; use `<-denotational' for U-00020DCE.
(U+55E3): Add `sound@ja/on/{kan|go}'; add some relations for other
characters.
(A-J0-6771): Unify A-IWDSU+82DF; add `ideographic-structure'.