(M-30757): Add `<-denotational' for U-00026B20; add `sound@ja/on'; add

(M-30757): Add `<-denotational' for U-00026B20; add `sound@ja/on'; add
`<-same' for U+833B; delete `<-unknown' for U-00026B20.
(G-RUI6-E03D): New character.
(RUI6-E03D): New character.
(A-UU+83E7): New abstract character.
(mother of C2-3F48): Use A-UU+83E7 instead of U+83E7 as the mother;
unify G-CU+83E7.
(C2-3F48): Unify CU+83E7.
(UU+83E7): Use A-UU+83E7 instead of U+83E7 as the mother.
(U-0002F99E): Add `<-denotational' for U+83E7.
(G-RUI6-E03E): New character.
(RUI6-E03E): New character.