(U+5782): Add `<-denotational@usage' for BUCS+5782; apply new

(U+5782): Add `<-denotational@usage' for BUCS+5782; apply new
conventions for glyph granularity.
(U-0002D38A): New character.
(A-cgnU+57C0): New abstract node.
(U+57C0): Add `<-denotational' for A-cgnU+57C0; add
`<-denotational@usage' for BUCS+5782; apply new conventions for glyph
granularity.
(A-U+57C0-itaiji-002): New abstract node; use `<-denotational' for
A-cgnU+57C0; use `<-denotational@usage' for BUCS+5782.
(U+57C0-itaiji-002): New character; use `<-denotational' for
A-U+57C0-itaiji-002.
(IU+2136E): Add `<-formed' for UU+5782.
(U-000213E3): New character.
(U-000213E5): New character.
(U-000213E8): New character.
(BUCS+5782): New abstract node; unify A2-DJT-01710.