This font is less complete than our bitmap font, Unifont: Unifont
has essentially complete Unicode coverage and LibreCAD's font only
has Latin, Cyrillic and Japanese, but it can be extended rather
easily, so this should be fine for now.
These embedded fonts fatten glhelper.o quite a bit:
bitmapfont.table.h is about 8M in gzip-compressed bitmaps and
vectorfont.table.h is about 2M in raw vector data.
In spite of that it takes just around five seconds to build
glhelper.c on my laptop, so it should be fine.
The final executable grows from about 2M to about 8M, but this
is a small price to pay for fairly extensive i18n support.
The new font has somewhat different metrics, so the rendering
code has been fudged to make it look good.
After this change, SolveSpace does not contain nonfree assets.
Additionally, Perl is not required for the build.
Note that in the US, case law suggests that copyright does
not apply to bitmap fonts:
http://www.renpy.org/wiki/renpy/misc/Bitmap_Fonts_and_Copyright
Nevertheless, it was prudent to replace the asset with something
that is unambiguously free.
