(U+5344): Unify BC-8975.

(U+5344): Unify BC-8975.
(C4-2244): Use `<-original-ideograph' instead of
`original-char-of-shinjigen-1'; unify U-00020983.
(C3-2329): Use `->ideographic-variants' instead of
`variant-of-shinjigen-1'.
(C6-2639): Use `<-vulgar-ideograph' instead of
`vulgar-char-of-shinjigen-1'; unify U-00020991.
(C4-2553): Use `<-vulgar-ideograph' instead of
`vulgar-char-of-shinjigen-1'; unify U-00024C1E.
(M-02739): Unify C4-2553 and U-00024C1E; use `<-vulgar-ideograph'
instead of `vulgar-ideograph-of'.
(J0-4234): Use U+4ECE instead of BC-8DF5 + U+4EBA in the
`ideographic-structure'.
(U+5352): Likewise.
- Add some missing `hanyu-dazidian-vol', `hanyu-dazidian-page' and
  `hanyu-dazidian-char' properties.
- Add some missing `ideographic-structure' properties.
- Merge some CHINA3-JEF code points.
- Use char-spec instead of char-ref as operators in
  `ideographic-structure' properties.
- Merge some CJK Ext-B code points.
- Merge some missing Big5-CDP code points.