[ab] lispbuilder-sdl API changes

[Frank Buss]

Luke J Crook wrote: 

> Here is the summary:
> 
> 1) Automatic CFFI finalization when foreign objects go out of scope.
> 2) Making the lispbuilder-sdl API's more lispy (contentious issue)
> 3) Having three layers of abstraction.

This sounds like a good idea. Thanks for your work!

--
Frank Buss, fb at frank-buss.de
http://www.frank-buss.de, http://www.it4-systems.de