implement Fontconvert in Python

[BillyDonahue]

Reimplements the fontconvert.c program in Python, which will make it more accessible to those who don't have a C compiler and freetype library installed. Verifies the fonts regenerated by the python implementation match the originals. There are very small number of single-pixel differences in output glyphs vs the originals, but these are due to FreeType version skew and visually look like improvements anyway.