[ANNC] SDL_FontCache

Hey guys, just wanted to mention some work I’ve been doing that should be
useful to all SDL devs.

I factored out the innards of NFont so I could make a more generic font
cache system in C. SDL_FontCache is what I got out of it. It does almost
everything that NFont does (which is everything you might usually do with
text). Check it out, contribute, and let me know what you think!

This is early, so there are some features missing and bugs included.

Jonny D