Changes

* Use the Amstrad interrupts and change the colours multiple times each frame, this will given give each region (between each interrupt) it's own colours increasing the number of colours on screen. Each region is 52 scanlines in height, and the whole screen in width. Note that the colours must be set for each region for each frame to maintain them, and that the pixels within each region are still limited to 4 colours in mode 1. The colour regions like this are ideal for HUDs. Note than any sprites or graphics that move over any two regions will have pixels with colours from both regions, changing where the regions meet.