Add `=decomposition@cid' for some Adobe-Japan1 abstract glyph-forms.

Add `=decomposition@cid' for some Adobe-Japan1 abstract glyph-forms.
(A-IWDSU+21C24): New abstract node.
(U-00021C24): Add `<-denotational' for A-IWDSU+21C24.
(U+5C3C): Apply new conventions for glyph granularity.
(UU+378D): Unify AJ1-13850.
(U+5C45): Apply new conventions for glyph granularity.
(A-GT-K04055): New abstract node; unify A-U+5C3F-itaiji-001; use
`<-denotational' for A-compU+3791; use `<-denotational@component' for
A-IWDSU+5C3F.
(U+5C3F-itaiji-001): New character; use `<-denotational' for
A-GT-K04055.
(GT-K04055): Use A-GT-K04055 instead of A-compU+3791; omit
`<-denotational@component' for A-IWDSU+5C3F; fix operator.
(U+5C4B): Apply new conventions for glyph granularity.
(U+5C55): Likewise.
(U-00021CAC): Likewise.