(U+56E0): Add `<-denotational@usage' for BUCS+56E0.

(U+56E0): Add `<-denotational@usage' for BUCS+56E0.
(UU+56E0): Unify DJT-01611.
(U+56E5): Add `<-denotational@component' for A-IWDSU+56E5; add
`<-denotational@usage' for A2-DJT-01614; add `sound@ja/on'; unify
DJT-01614.
(U+56ED): Add `<-denotational@component' for A-IWDSU+56E5; add
`<-denotational@usage' for BUCS+5712 and A2-DJT-01620; add
`sound@ja/on/{kan|go}'; unify DJT-01620.
(U-000211B6): Apply new conventions for glyph granularity for
components of ideographic-structure; add `sound@ja/on'.
(IU+211B6): Unify MJ032820 and KOSEKI-053890; add some relations for
other characters.
(U+5712): Add `<-denotational@usage' for BUCS+5712 and A2-DJT-01644;
add ideographic-structure.
(UU+5712): Add `ideographic-structure'; unify DJT-01644.
(A-IWDSU+56E5): New abstract node.
(BUCS+56E0): New abstract node; unify A2-DJT-01611.
(A2-DJT-01614): New abstract node.
(BUCS+5712): New abstract node.
(A2-DJT-01620): New abstract node; use `<-denotational' for BUCS+5712.
(A2-DJT-01644): New abstract node; use `<-denotational' for BUCS+5712.