(U-00021562): Apply new conventions for glyph granularity.

(U-00021562): Apply new conventions for glyph granularity.
(U-00021563): Likewise.
(A-GT-K04020): New abstract node; use `<-denotational' for
A-GT-K04019; unify A-U+21562-itaiji-004.
(U+21562-itaiji-004): New character; use `<-denotational' for
A-GT-K04020.
(GT-K04020): Likewise.
(A-M-05717): Unify A-cgnU+590D; add `ideographic-structure'.
(U+3686): Apply new conventions for glyph granularity.
(U+590D): Add ideographic-structure.
(U+3687): Likewise.
(U+590F): Likewise.
(U-0002156B): Use U+20486-itaiji-003 in `ideographic-structure'; add
`sound@ja/on'.
(IU+2156B): Use U+20486-itaiji-003 in `ideographic-structure'; unify
MJ033339 and KOSEKI-065590.