This change adds a boatload of ROM patches to alter screen base, resolution,
words-per-line, and related variables so that MacOS will function correctly
with a framebuffer other than 512x342 (which remains the default).
The majority of the patches are actually to make ROM-drawn low-level things
(such as disc icons, happy/sad Mac icons/crash hexadecimal info) render
right and be positioned correctly.
This works up to about 800x600; the limiting factor is patching int16
immediates for certain instructions, meaning a ~64KB framebuffer size
is the current limit without more work.
The Makefile can now take DISP_WIDTH/DISP_HEIGHT parameters to configure
a build. There is no support for dynamic switching, or runtime-selected
switching.
