[AD] Adding save/load font functions

[Bob <ohannessian@xxxxxxxxxx>]

Hi,

I think it would be a good idea to have save/load FONT functions in Allegro. 
Although for most cases it'll default to load_datafile_object(), it would 
help add-ons that use their own special font formats.

For example, AllegroGL does some heavy computations on fonts when doing a 
conversion (and I'm adding some more to save texture space). Being able to 
save/load the intermediary results (saved in the FONT structure) via a hook 
would be very helpful towards reducing load times on AllegroGL programs.

Sure, AllegroGL can have it's own API for this, but since it manipulates 
Allegro FONTs anyway, I thought it would be a good idea to have this inside 
Allegro.

It could also be helpful for other add-ons, and also would serve to complete 
the API - we already have load/save pairs for just about everything.


--
- Robert J Ohannessian
"Microsoft code is probably O(n^20)" (my CS prof)
http://pages.infinit.net/voidstar/