Log Message:
Update umefont to 0.418.

Changelog:
In Gothic (Sans-serif) family
 * Fix glyphs in Unicode : 0020-52ea, 9fa0-ffff (first check)
 * Fix glyphs in SJIS : 0020-93c7, ea66-fcff (second check)

In Minchi (Serif) family
 * Fix glyphs in Unicode : 0020-529a, 9fa0-ffff (first check)
 * Fix glyphs in SJIS : second check completed