#25 Separate compilation of each font.

[Richard Rauch]

To achieve maximal symbol privacy, OpenGLEAN compiles
the libraries as single, big sources (stitched together
via #include statements).

While symbol privacy is generally a good thing, the font
library is little more than a data repository. It may
make sense to migrate the font data back to a public
status and allow for separate compilation of the
extensive data that make up the bitmapped fonts.

This only applies to gleanfonts. I don't anticipate
changing the core OpenGLEAN library.