SVG optimization from <rect> to <path>?

[imcotton]

The current SVG implementation generates multiple <rect> elements to render the bit blocks. I think it could be optimized by using a single <path d="..."> within the <svg> element.

This way could significantly reduce file size and improve efficiency, it may be worthwhile to look into.

[paulmillr]

Pull reqs are welcome!

[imcotton]

Disclaimer: I only bumped other libraries with this compact SVG rendering approach for QR codes. I'm not an expert on this very topic, so maybe someone with more experience or knowledge would take this on. Thanks!