replace Endroid\QrCode with BaconQrCode

[johndoh]

Endroid\QrCode requires min PHP 7.3 but now so does master so we can update

[alecpl]

There's one problem with this update. endroid/qr-code#341

[johndoh]

Ouch! I did not notice that. Perhaps we could switch to bacon/bacon-qr-code endroid requires it already any way and its much lighter weight. A very quick test suggests it should be a relatively easy switch.

$renderer = new BaconQrCode\Renderer\ImageRenderer(
    new BaconQrCode\Renderer\RendererStyle\RendererStyle(300, 1),
    new BaconQrCode\Renderer\Image\ImagickImageBackEnd()
);
$writer = new BaconQrCode\Writer($renderer);
return $writer->writeString($data);

[alecpl]

I think we could do this way. The check at https://github.com/roundcube/roundcubemail/blob/master/program/actions/contacts/index.php#L345 would need to be changed to check for imagick and iconv extensions.

[johndoh]

redesigned PR to replace Endroid\QrCode with BaconQrCode. BaconQrCode is already a dependency of Endroid\QrCode so results in a smaller but not totally different 3rd party dependency tree.