Raspberry Pi 4 is different, book code won't work!

[Brian Beuken]

I've now worked out how to do a change resolution system (detailed elsewhere) so while I am going to miss the Broadcom's "auto" stretch systems, we do now have the ability to change the screen res in code so we can once again work on reasonable sized frame buffers. This will now allow me to rework the demo's to inlude Rpi4 functionality.

Note, this is using X11 though which is going out of favour in the Linux world so as soon as I can invest some research time I'll look into other render targets as soon as I can.