(IWDS1-0219): Unify A-IWDSU+51AB instead of U+51AB; delete

(IWDS1-0219): Unify A-IWDSU+51AB instead of U+51AB; delete
`<-denotational@component' for IWDS1-0047.
(AJ1-04233): Unify U+51AB instead of UU+51AB; use
`<-denotational@component' for IWDS1-0047 and IWDS1-0219 instead of
`<-denotational' for IWDS1-0219.
(BC-8971): Use `<-denotational@component' for IWDS1-0219 instead of
`<-denotational' for U+51AB.
(U+51AC): Add `ideographic-structure'.
(U-0002F81A): Separate KU+51AC and K0-544F; apply new conventions for
glyph granularity.
(UU+51AC): Unify K0-544F.
(U+51B7): Add intermediate glyph nodes.
(U-00020605): Add `sound@ja/on/{kan|go}'.
(IU+20605): Unify MJ031137 and KOSEKI-020300.
(UU+51DB): Apply new conventions for glyph granularity.