(U+6758): Add `<-denotational@usage' for A2-DJT-04745; use

(U+6758): Add `<-denotational@usage' for A2-DJT-04745; use
`->denotational' and `->subsumptive'.
(U-00023409): Use `->denotational' and `->subsumptive'.
(U+67C5): Add `<-denotational@usage' for A2-DJT-04838; apply new
conventions for glyph granularity.
(U-00023410): Apply new conventions for glyph granularity.
(U-000234BA): Likewise.
(U-0002DAE2): Fix `ideographic-structure'.
(U+6AB7): Add `<-denotational@usage' for A2-DJT-05437; apply new
conventions for glyph granularity.
(A2-DJT-04745): New abstract node.
(A2-DJT-04838): New abstract node.
(A2-DJT-05437): New abstract node.