Method writeCRGB

tests/fl/fx/video.cpp:46–49

        return len;
    }
    size_t writeCRGB(const CRGB *src, size_t len) {
        size_t bytes_written = writeData((const uint8_t *)src, len * 3);
        return bytes_written / 3;
    }
    size_t read(char *dst, size_t bytesToRead) override {
        size_t bytesRead = 0;
        while (bytesRead < bytesToRead && mPos < data.size()) {