(U+3555): Add `ideographic-structure'; add `sound@ja/on'; add

(U+3555): Add `ideographic-structure'; add `sound@ja/on'; add
`<-ancient' for UU+5E7B.
(U+53B8): Apply new conventions for glyph granularity.
(U-00020AEB): Likewise.
(U-00020AEC): Likewise.
(U-00020AEF): Likewise.
(IWDS1-0016): Use `<-denotational@usage' instead of `<-denotational'
for BUCS+53C3.
(U-00020AF0): Apply new conventions for glyph granularity.
(IWDS1-0017): Use `<-denotational@usage' instead of `<-denotational'
for BUCS+53C3.
(U+3558): Use `<-denotational@usage' instead of `<-denotational' for
BUCS+53C3.
(U+53C5): Likewise.