`sound@ja/on/{kan|go}'.
(U+FA30): Unify DJT-00312; add some relations for other characters.
(A-U+501D-itaiji-005): Use A-compU+501D instead of A-cgnU+501D as its
mother.
(U-0002EBFF): New character.
(U-000203C1): Apply new conventions for glyph granularity.
(U-00020452): Apply new conventions for glyph granularity.
(BUCS+4FAE): Unify A2-DJT-00312.