Comparisons with ArcCommand

While I'm basing it on some earlier work, it has been rewritten because the previous version did not need to worry about a number of things:

• Small RAM usage (I've only got 64K RAM to play with)
• OLED driver chip is a bit limiting, and is a little slow (previously, it was able to access the screen directly - the new code does not do this at all)
• Smaller screen
• More colours (the previous version uses 256 colour display; this can use 18-bit display, but it does switch into an 8-bit driver mode [it still shows 18-bit, but means it's quicker to write pixels if you're not too worried about the other bits])
• I've removed references to other things, and reorganised the display. This means I have not copied ANY code, graphics or text from anywhere else
• Analogue joystick