Add glyph-images of HNG-KHM.

Add glyph-images of HNG-KHM.
(U+225BB-itaiji-001): New character; add `<-formed' for U-000225BB.
(U+225BB-itaiji-002): Likewise.
(U+225BB-itaiji-003): Likewise.
(U-000225CC): Unify S-2448 and H6-D7A3; add `<-formed' and `<-same'
for U+6015.
(BUCS+5FEB): New abstract node.
(U+5FEB): Apply new conventions for glyph granularity; add
`<-denotational' for BUCS+5FEB.
(HNG-KHM0333-0): New character; add `<-denotational' for BUCS+5FEB;
add `<-formed' for U+5FEB.
(U-000225D8): Unify S-2409; add `<-formed' and `<-same' for U+5FFD.
(U+60A3-var-001): New glyph node to subsume HNG-KHI0380-0 and
HNG-KHM0051-0; add `<-subsumptive' for U+60A3.
(U+60D1): Separate UU+60D1.
(HNG-KHM0045-0): New character; add `<-denotational' for U+60D1.
(U+60D3): Separate A-UU+60D3.
(HNG-KHM0338-0): New character; add `<-denotational' for U+60D3.
(U+611B-itaiji-001): New character to subsume HNG-KHM0326-0; add
`<-denotational' for U+611B.
(U+6167-var-001): New character to subsume HNG-KHI0389-0 and
HNG-KHM0320-0; add `<-denotational' for U+6167.
(U+6176): Separate A-UU+6176.
(A-UU+6176): Add `=>ucs@iwds-1'.
(HNG-KHM0323-0): New character; add `<-denotational' for U+6176.
(HNG-KHI0372-0): Fix `ideographic-strokes' and `total-strokes'; modify
`ideographic-structure'.
(U+6182-itaiji-003): Add HNG-KHM0328-0.
(HNG-KHM0339-0): New character; add `<-denotational' for U+61C8.
(MJ057525): New character; add `<-denotational' for U+61D0; unify
HD-KS126860; add HNG-KHM0321-0.