Garnet Revival

I decided to try to use Garnet for a project I've had in mind for some time, so to get my feet wet I added scroll-wheel support to Garnet. Once that was done, I decided to try to add TrueType support and to bring the code more up to modern coding practices (though I haven't tried converting all the loops to use the LOOP macro---that's left as an exercise for the reader). The point is that Garnet is now active again, at least for the time being.

Currently it supports SBCL, CMUCL, CCL and Allegro CL. I've committed my work to Sourceforge's subversion repository. The trunk should be relatively stable; I've created a 3.3-devel branch that I commit my work to.

TrueType support is not yet working but I hope to see real progress soon. Otherwise, there are many code improvements and some refactoring to make the code easier to understand.