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This PR begins to add variables necessary to implement the CoCo 3 advanced graphics modes (those outside of the ones provided by the CoCo 1/2). Variables are added to control the border color, and the offset resolution register was updated to be in line with the concept of 2 registers to control where in video memory the offset should begin. The offset calculation was also updated and simplified to use shifting instead of heavier multiplication instructions. Unit tests updated to reflect changes to existing functionality.