EGX mode for CPC
In this custom mode, odd lines use MODE 0 (wide pixels, 16 colors), and even lines use MODE 1 (square pixels, 4 colors). - Add a settings window to the 8-bit effect where you can chose what you want to draw - Add the customizations required to make it work in graph.c - Tweak some other places so it is easier to add other modes later on. - Groundwork for some more modes: EGX2, ZX spectrum, Game Boy color.
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