Added ability to add images to QR Code

[Nemesis-AS]

Fixes #33

This PR adds the ability to add images to the QR Code. The ECC(Error Correction Code) is set automatically if an image is used.

This PR also removes the dependency file-saver, since the QR is manipulated on the client side and it is being downloaded using built-in browser methods, without the need for any dependencies.

I also changed the default value of the download format from JPEG to PNG since JPEGs use lossy compression, which may affect the readability of the QR Code.

QR_Code_Image_Demo.mp4

Any feedback is appreciated.

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[1010varun]

@Nemesis-AS by adding the logo user is unable to scan it.

[Nemesis-AS]

I guess it might happen on the website because the canvas is being scaled down by default. It should work if the layout is changed so the canvas is not scaled down. I tested the QRs after downloading and it worked

Another fix can be tweaking the size of the logo to be even smaller

[1010varun]

@Nemesis-AS I am unable to scan QR like this, can you fix this issue

[Nemesis-AS]

I'll try tweaking the size of the image to see if it works then

[1010varun]

@Nemesis-AS any updates on this

[Nemesis-AS]

I have been unable to make any progress on this issue due to some urgent health issues, but will do it as soon as I can

[Nemesis-AS]

I have reduced the image size and it can easily be adjusted further. I tried a few qr codes and they all seem to work now. Let me know if any still fail