Method draw

tests/fl/fx/video.cpp:266–270

    Fake2d() : Fx2d(XYMap::constructRectangularGrid(1,1)) {}

    void draw(DrawContext context) override {
        CRGB c = mColors[mFrameCounter % mColors.size()];
        context.leds[0] = c;
        mFrameCounter++;
    }

    bool hasFixedFrameRate(float *fps) const override {
        *fps = 1;