Add some representative nodes.

Add some representative nodes.
(UU+53CA): Use `ideographic-{radical|strokes}@daikanwa' and
`total-strokes@daikanwa' instead of
`ideographic-{radical|strokes}@ucs' and `total-strokes@ucs'; move
U-0002F836 to g2-UU+53CA; apply new conventions for glyph granularity;
apply new conventions for glyph granularity.
(g2-IU+20B1C): Separate g2-CU+20B1C.
(U+53D2): Apply new conventions for glyph granularity.
(U-0002F837): Unify GT-03987 and GT-K02969.
(U+53DB): Apply new conventions for glyph granularity.
(UU+6700): Move U-0002F8D4 to g2-JU+2F8D4.
(U-00021A9E): Apply new conventions for glyph granularity.
(AJ1-08410): Omit IU+FA0E.
(U-00020B96): Apply new conventions for glyph granularity.