(GT-K00264): Add `<-denotational' for U+5140; add U+4E0C as a target

(GT-K00264): Add `<-denotational' for U+5140; add U+4E0C as a target
of `<-formed@component/connect-above'; delete `->mistakable' for
U+4E0C.
(U+51AC-itaiji-002): New character; use `<-denotational' for
A-cgnU+20082.
(U-0002050F): Apply new conventions for glyph granularity.
(A-BC-8747): New abstract node; use `<-denotational' for A-cgnU+20082.
(BC-8747-var-002): New character; use `<-denotational' for A-BC-8747.
(BC-8747-var-003): Ditto.
(GT-K03387): New character.
(BC-8747): New character; use `<-denotational' for A-BC-8747.
(U+5176): Modify structure; add `sound@ja/on/{kan|go}'; add some
relations for other characters
(U-00020513): Apply new conventions for glyph granularity.
(U-00020519): Likewise.
(U-0002051D): Likewise.
(U-0002051E): Likewise.