A new f437_surface_new_sized function was added. It creates a F437Surface of limited rows and columns, scaled as large as possible, and centred in the SDL_Surface.
There have been some changes to how the surface API frees memory. A layer-based abstraction called 'F437Display' has been added, with corresponding C++ class fake437::Display. The C++ API has been slightly enriched.
Support for multiple (and user-defined) fonts, by way of the F437Font struct. The primitive interface needs the font passed in on every call, while the surface interface saves the font at surface creation. Use f437_get_font to get one of the pre-defined fonts: F437_FONT_8x8, F437_FONT_8x8_THIN, or F437_FONT_8x14. There is a new function f437_surface_try_new that doesn't abort() on allocation failure.
