Add glyph-images of HNG-KAR.

Add glyph-images of HNG-KAR.
(BUCS+7C21): New abstract character.
(U-00025CD1): Add `<-denotational' for BUCS+7C21; apply new
conventions for glyph granularity.
(U+7B80): Add `<-denotational' for BUCS+7C21; add `<-simplified@CN'
for U+7C21.
(U+7C21): Add `<-denotational' for BUCS+7C21.
(U+7C69): Apply new conventions for glyph granularity.
(A-MJ019778): New abstract node; use `<-denotational' for U+7C69.
(JSP-5324): Use A-MJ019778 instead of U+7C69 as the mother; unify
MJ019778 and KOSEKI-299610.
(HNG-KAR0281-0): New character; use `<-denotational' for A-MJ019778.
(A-UU+7C69): New abstract node; use `<-denotational' for U+7C69.
(C2-712B): Use A-UU+7C69 instead of U+7C69 as the mother; unify
CU+7C69.
(JX2-736F): Use A-UU+7C69 instead of U+7C69 as the mother.
(UU+7C69): Use A-UU+7C69 instead of U+7C69 as the mother; unify
HD-IB0844.