Add glyph-images of HNG-KHM.

Add glyph-images of HNG-KHM.
(BUCS+82E6): New abstract node.
(U+82E6): Add `<-denotational' for BUCS+82E6.
(U+82E6-itaiji-001): New character to subsume HNG-KHI0542-0 and
HNG-KHM0507-0; add `<-denotational' for BUCS+82E6.
(U+83E9-itaiji-001): New character to subsume HNG-KHM0506-0 and
HNG-KHI0546-0; add `<-denotational' for U+83E9.
(BUCS+840C): New abstract node.
(U+840C): Add `<-denotational' for BUCS+840C.
(HNG-KHM0116-0): New character; add `<-denotational' for BUCS+840C;
add `<-formed' for U+840C.
(U+8420): Add `<-denotational' for BUCS+840C.
(HNG-KHM0499-0): New character; add `<-denotational' for U+840E.
(U+8457-itaiji-001): New character to subsume HNG-KHI0552-0 and
HNG-KHM0114-0; add `<-denotational' for U+8457.
(BUCS+8499): New abstract node.
(U+8499): Add `<-denotational' for BUCS+8499.
(HNG-KHM0502-0): New character; add `<-denotational' for BUCS+8499;
add `<-formed' for U+8499.
(U+84EE): Separate A-UU+84EE.
(A-UU+84EE): Add `=>ucs@iwds-1'.
(A-MJ022604): New abstract character; add `<-denotational' for U+84EE.
(HNG-KHM0508-0): New character; add `<-denotational' for A-MJ022604.
(MJ022604): Likewise; unify HD-JT-BCFD and KOSEKI-355950.
(BUCS+85A9): New abstract node.
(U+85A9): Add `<-denotational' for BUCS+85A9.
(U+8428): Likewise.
(U+85A9-itaiji-003): New character to subsume HNG-KHM0504-0 and
HNG-KHI0545-0; add `<-denotational' for BUCS+85A9; add `<-formed' for
U+85A9.
(U+85D0-var-001): New character to subsume HNG-KHI0543-1 and
HNG-KHM0503-0; add `<-denotational' for U+85D0.