Expose ability to register externally-loaded fonts with glyph mutate callbacks.

Integrate glyph-mutating callback into atlas preparation.

Upgrade API Usage, fixing build (#10)

* Get Typograffiti to successfully compile by upgrading FreeType2 API usage

* Upgrade SDL API usage by test program.

Co-authored-by: Adrian Cochrane <alcinnz@VirtualBox-7e9ebd4b.localdomain>
Co-authored-by: Adrian Cochrane <alcinnz@lavabit.com>

monad fail

docs update

removed MonadTextRenderingT in favor of FontStore

default alloc word function

word cache

displays correctly

first commit