(U+7CF9): Use `<-formed@component' instead of

(U+7CF9): Use `<-formed@component' instead of
`<-ideographic-component-forms'; unify BC-8AFB.
(<CJK RADICAL SILK>): Use `<-formed@component' instead of
`<-formed@component' for U+7CF8; use
`<-identical@component/connect-right' instead of `<-radical' for
U+7CF9; separate BC-8AFB.
(<CJK RADICAL C-SIMPLIFIED SILK>): Use
`<-identical@component/connect-right' instead of `<-radical' for
U+7E9F; use `<-simplified@CN/component/connect-right' instead of
`<-ideographic-component-forms' for U+7CF8; separate BC-895B.
(U+7E9F): Add `<-simplified@CN/component' for U+7CF8; unify BC-895B.