(U-000204DB): Separate IU+204DB.

(U-000204DB): Separate IU+204DB.
(C6-2136): Unify IU+204DB instead of U-000204DB; add `<-denotational'
for U-000204DB.
(U+204DB-var-001): New character; use `<-denotational' for U-000204DB.
(A-U+204E1-itaiji-001): New abstract node; unify A-U+77E2-itaiji-003.
(U+77E2-itaiji-003): New character; use `<-denotational' for
A-U+204E1-itaiji-001.
(U+204E1-itaiji-001): Ditto.
(U-000204E4): Apply new conventions for glyph granularity.
(U+34B4): Likewise.
(U+516A): Add ideographic-structure.
(GT-K05210): Unify HD-FT2079.