(U+9F20): Add `ideographic-structure'.

(U+9F20): Add `ideographic-structure'.
(U+9F21): Add `<-denotational@usage' for A2-DJT-14790; apply new
conventions for glyph granularity.
(BC-8D46): New character; unify GT-K03257.
(U-0002A53B): Apply new conventions for glyph granularity.
(U+4D83): Likewise.
(U-0002A546): Likewise.
(U+9F27): Likewise.
(U+9F28): Likewise.
(A-IWDSU+2A54E): New abstract node.
(U-0002A54E): Add `<-denotational' for A-IWDSU+2A54E; apply new
conventions for glyph granularity.
(U-0002A54F): Likewise.
(U+9F2C): Add `<-denotational@usage' for BUCS+9F2C; apply new
conventions for glyph granularity.
(U-0002A55B): Apply new conventions for glyph granularity.
(U-0002A57B): Likewise.
(U-0002A58B): Likewise.
(BUCS+9F2C): New abstract node; unify A2-DJT-14797.