Added simple test to create a tile programattically and load it in.
Added tests to tile test to show that shift registers work. Unfortunately, I think that the x and y registers are switched
Added testrunner to default list of tests that are executed
Added comment to tile test
Made the reset function of the whizgraphics actually reset the
graphics hardware. I also fixed the way reset was initiated in the interface, it now properly uses the clocking block signal