Super Spectrum World 0.25 released

There's only a few minor changes in this new release.  I've added "slopes", so floors that are at an angle (e.g. the Treasure Island Dizzy screen) will actually be a slope when walked on.  Oh, and there's also a cheatcode.  Obviously I'm not going to give it away, but also obviously it's Jet Set Willy related and should be able to be worked out.