(U+7263): Add `<-denotational@usage' for A2-DJT-07077; apply new

(U+7263): Add `<-denotational@usage' for A2-DJT-07077; apply new
conventions for glyph granularity.
(U-00024638): Add `sound@ja/on/{kan|go}'.
(U-00024688): Apply new conventions for glyph granularity.
(U-00024686): New character.
(U-00024687): New character.
(U+7295): Apply new conventions for glyph granularity.
(U-000246DF): Use `->denotational' and `->subsumptive'.
(U-000246DC): New character.
(U-0002DDF0): New character.
(M-49289): Add `<-denotational' for U-0002DDF0; unify hanaJU+2DDF0,
MJ058027 and KOSEKI-226690.
(U-000246D5): New character.
(A2-DJT-07077): New abstract node.