(IWDS1-0049): New abstract component.

(IWDS1-0049): New abstract component.
(U+620C): Add `<-denotational@component' for IWDS1-0049; add
`sound@ja/on/{kan|go|conventional}'; add `->mistakable' for U+620A,
U+6209 and U+620D.
(U+620D): Add `<-denotational@component' for IWDS1-0049; add
`ideographic-structure'; add `sound@ja/on' and
`sound@ja/on/conventional'.
(IWDS1-0274): New abstract component.
(U+39AE): Add `<-denotational' for IWDS1-0274; add `sound@ja/on';
apply new conventions for glyph granularity.
(U+620B): Add `<-denotational' for IWDS1-0274; add representative
nodes.