- Add some missing Hanyo-Denshi/KS code points.

- Add some missing Hanyo-Denshi/KS code points.
- Add `=decomposition@hanyo-denshi' for some abstract glyph-forms of
  Hanyo-Denshi/KS.
- Add some MJ code points corresponding to Hanyo-Denshi IVSes.
(A-cgnU+3687): New abstract node.
(U+3687): Add `<-denotational' for A-cgnU+3687; add
`<-denotational@usage' for A2-DJT-01925.
(CU+3687): Unify DJT-01925.
(U-00021569): Add `<-denotational@component' for A-compU+21569.
(U+5913): Add `sound@ja/on'.
(A-compU+21569): New abstract node.
(A2-DJT-01925): New abstract node.