Add glyph-images of HNG-KHM.

Add glyph-images of HNG-KHM.
(U+5BF8): Separate UU+5BF8.
(UU+5BF8): Add `=>ucs@iwds-1'.
(U+5BF8-itaiji-001): New character; add `<-denotational' for U+5BF8.
(U-0002A9F7): New character.
(A-UU+5BFD): New node; add `<-denotational' for U+5BFD.
(U+5BFD-itaiji-003): New character; add `<-denotational' for
A-UU+5BFD.
(UU+5BFD): Use A-UU+5BFD instead of U+5BFD as the mother.
(BC-8BC3): New character; add `<-denotational' for U-0002A9F7; unify
GT-K02773.
(A-UU+5C06): New node; add `<-denotational' for U+5C06; unify
A-CU+2F873, A-C6-3667, A-GT-09354 and A-M-07437.
(CU+2F873): Use A-UU+5C06 instead of U+5C06 as the mother.
(UU+5C06): Likewise.
(A-JU+5C06): New node; add `<-denotational' for U+5C06; unify
A-J0-3E2D, A-GT-09355 and A-GT-K06466.
(JU+5C06): Use A-JU+5C06 instead of U+5C06 as the mother.
(HNG-KHM0289-0): New character; add `<-denotational' for A-JU+5C06.
(BUCS+5C0A): New abstract node.
(U+5C0A): Add `<-denotational' for BUCS+5C0A; don't subsume
HNG-KHI0345-0.
(A-MJ057359): New abstract character; add `<-denotational' for
BUCS+5C0A; add `<-formed' for U+5C0A; move HNG-KHI0345-0 from U+5C0A;
add MJ057359 and HNG-KHM0291-0.
(HNG-KHI0042-0): Use `<-subsumptive' for UU+5C0B instead of
`<-denotational' for U+5C0B.
(UU+5C0B): Subsume HNG-KHI0042-0 and HNG-KHM0288-0.