Add some mappings between CNS 11643-6 and CJK Ext-B code points.

Add some mappings between CNS 11643-6 and CJK Ext-B code points.
(U+8CC5): Use `->subsumptive'.
(C6-5862): Unify U-00027D70 and H1-D1AC.
(U+8CD5): Use `->subsumptive'.
(U+8CE6): Use `ideographic-strokes@daikanwa' instead of
`ideographic-strokes'; use `ideographic-strokes@cns' instead of
`kangxi-strokes'; add `total-strokes@daikanwa'; use
`total-strokes@cns' instead of `total-strokes'.
(U+477E): Unify M-36801.
(U-00027D96): New character.