Method reset

src/fl/math/grid.h:20–30

    Grid(u32 width, u32 height) { reset(width, height); }

    void reset(u32 width, u32 height) {
        clear();
        if (width != mWidth || height != mHeight) {
            mWidth = width;
            mHeight = height;
            mData.resize(width * height);

        }
        mSlice = fl::MatrixSlice<T>(mData.data(), width, height, 0, 0,
                                    width, height);
    }

    void clear() {
        for (u32 i = 0; i < mWidth * mHeight; ++i) {