h264 video rendering

When enabled, Monolith h264 has the ability to generate h264 video.

Words in progress.

Begin with monolith-h264-begin. Supply the filename to write to and the FPS.

(monolith/h264-begin "out.h264" 60)

Draw your stuff to the framebuffer, then append a frame with monolith/h264-append.

(monolith/h264-append)

At the end of the program, wrap things up with h264-end.

(monolith/h264-end)