Made changes to numbers/delimeters in `font.png'.

This isn't the final iteration, but they're more readable now. The
`7', `{', and `}' characters are pretty ugly, but I'll improve them
in time.
Added automatic dependency generation.

Now the build system will rebuild a file whenever any related
headers are changed, etc...
Added the `grafix_BitMap' type.

A 2D monochrome image type. Designed for testing whether a point is
inside of an image or not (i.e. is the mouse over a particular
sprite or not?)
Implemented `grafix_BitMap'.

2D array of bits, pretty straightforward.
Added GPL to a few files that were missing it.
Added methods on `grafix_BitMap' type.
Modified build system to reduce clutter.

Now rather than putting all `*.o' files next to their respective
`*.c' file, we put them in a seperate `obj/' directory tree.
Textures now generate a bitmap when loaded.

This will be useful for determining whether or not a sprite has
been clicked. See `grafix/bitmap.c'
Some minor changes for the COSI demo.