memory-mapping

It would be better and easier to debug a program if the BytesEncoding and BytesDecoding traits could return any error type.

To do so we need to modify the Error enum and more specifically the Encoding and Decoding variants to wrap a Box<dyn Error>.

Let's consider the code:

...
lirs::V4L2VideoCapture capture("/dev/video0", ...);
if (capture.IsOpened()) {
    capture.StartStreaming();
    // formats, frame, etc. rate are negotiated, buffers are allocated
    capture.Set(lirs::CaptureParams::FPS, 60);   // change the frame
}

In the code above frame rate is being changed during streaming process.
Currently, this change wil