add a 24px font and a 20px import font that uses it

stepmania/Themes/default/Fonts/_20px fonts.ini

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+# This "font" just pulls in default characters for a 20-pixel
+# font.  Other import fonts can be created for other sizes.
+
+# Also, themes can create new fonts, and overload this file to
+# have them pulled in for every 20-pixel font.
+[main]
+# We don't have a 20px Japanese font, so use the 24px one instead;
+# pulling in a Kanji font that's a little too big looks fine, but
+# pulling in one that's a little too small looks bad.
+
+# The characters in _game chars 16px are actually very large; they'll
+# look fine here, too.
+
+import=_japanese 24px,_game chars 16px
+# XXX ,_misc 16px

stepmania/Themes/default/Fonts/_japanese 24px.ini

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+# Approximately 24x24-pixel CJK font.  (That is, it should look 
+# reasonable alongside Western fonts that are about 24 pixels high.)
+# Most units are 28, to give up to 4 pixels of padding on each side.
+
+# Constructed from MS Gothic, 9pt, 72 pixels/cm, "Strong" antialiasing.
+
+[main]
+Top=5
+Baseline=26
+LineSpacing=28
+
+# This page maps to basic-japanese (Unicode U+3000 to U+30FF.)
+range basic-japanese=0
+
+# All characters on this page have a width of 20 pixels; it's a strictly
+# monospaced font.
+DefaultWidth=28
+
+# Smaller center dot.
+251=14
+
+[kanji]
+Top=5
+Baseline=26
+LineSpacing=28
+DefaultWidth=28
+
+map num-ichi=0
+map num-ni=1
+map num-san=2
+map num-yon=3
+map num-go=4
+map num-roku=5
+map num-nana=6
+map num-hachi=7
+map num-kyuu=8
+map num-juu=9
+
+map kakumei1=16
+map kakumei2=17
+map matsuri=18
+map sakura=19
+map kosaka1=20
+map kosaka2=21
+map oni=22
+map michi=23
+map futatsu=24
+map kami=25
+map sama=26
+map minyou1=27
+map minyou2=28
+map aka=29
+map nichi=30
+map aoi=31
+map shoudou1=32
+map shoudou2=33
+map neko=34
+map hair=35
+map anettai1=36
+map anettai2=37
+map anettai3=38
+map bakudan1=39
+map bakudan2=40
+map shintani1=41
+map shintani2=42
+map ookii=43
+map kenkai1=44
+map kenkai2=45
+map mahou1=46
+map mahou2=47
+map tobira=48
+map yozora1=49
+map yozora2=50
+map sai=51
+