Add missing GB 12345 and KS X 1001 code points.

Add missing GB 12345 and KS X 1001 code points.
(M-02872): Separate C6-2F3D; unify K0-716D, C3-2B4B, JX1-2E71 and
U+537D.
(M-02877): Use `<-vulgar-ideograph' instead of `comment'.
(M-02878): Use `<-vulgar-ideograph' instead of `comment'.
(M-02879): Use `->ideographic-variants' instead of
`variant-of-shinjigen-1'.
(C6-3D59): Use `<-vulgar-ideograph' instead of `comment'.
(U+537F): Use `<-vulgar-ideograph' instead of
`variant-of-shinjigen-1'; delete `kangxi-strokes' and
`japanese-strokes'.