Common default now falls back on _16px fonts (which imports japanese, korean, game chars, misc.)

Themes/_fallback/Fonts/Common default.ini

@@ -7,4 +7,8 @@ Top=3
 Bottom=29
 
 map default=0
-map invalid=1
+map invalid=1
+
+# Load the default 16-pixel glyphs.  They can be overridden by fonts
+# later.
+import=_16px fonts

Themes/_fallback/Fonts/_16px fonts.ini

@@ -0,0 +1,7 @@
+# _16px fonts is a "virtual font" that assembles various fonts into a unified
+# place. _16px fonts in particular is imported in Common default.ini.
+
+# Also, themes can create new fonts, and overload this file to
+# have them pulled in for every 16-pixel font.
+[main]
+import=_japanese 16px,_korean 16px,_Thai 16px,_misc 16px,_game chars 16px

Themes/_fallback/Fonts/_20px fonts.ini

@@ -0,0 +1,13 @@
+# 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,_korean 24px,_game chars 16px,_misc 16px