export some framebuffer/renderbuffer symbols
Remove spurious warning with ECL

closes #36
better handling of function args that can be pointers or offsets

Can pass offsets directly as integers, instead of needing to wrap them
with (cffi:make-pointer).

closes #35
rewrite binding generator for new .xml spec files
clean up commented/debugging junk in new bindings generator
download new .xml spec file
print some info about what changed when generating bindings
reformatted generated comments a bit
update low-level bindings (%GL:) to gl 4.4
fix bug in binding generator and regenerate bindings

closes #42
fix makefile
download new spec file
update low-level bindings (%GL:)
add OFFSET-OR-POINTER args to new binding generator, regenerate bindings
get rid of old binding generators