Add Hanyo-Denshi/JA code points.

Add Hanyo-Denshi/JA code points.
(U+56F3): Use `->subsumptive' to separate representative nodes.
(JSP-3721): Unify HD-JB2301.
(U+56FF): Add ideographic-structure.
(U+5708): Use `->denotational'.
(U+5709): Add ideographic-structure.
(U+570D): Likewise.
(J78-5423): Separate GT-06038, GT-K9174 and S-1309.
(B-B9CF): Add ideographic-structure; unify G-JU+5716, G-KU+5716 and
G-CU+5716.
(K0-5371): Unify KU+5716.
(C1-6837): Unify CU+5716.
(mother of C6-5B5B): Unify G-UU+5716 and G-CU+2F84B.
(U+5717): Use `->denotational' to integrate U-0002F84D.