The video code now writes out a bmp file per-frame. With this patch
applied, the Nintendo logo is rendered in each frame.
There is still plenty of work to be done. Pretty much everything is
hardcoded to make the bootrom work.
By reading directly from a "RAM" array, and copying in the cart data
over the old bootrom.
Also, some other fixups because I'm too lazy to properly split patches
for a personal project.
