Use composer and change QR code generation library

vendor/bacon/bacon-qr-code/README.md

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+# QR Code generator
+
+[![PHP CI](https://github.com/Bacon/BaconQrCode/actions/workflows/ci.yml/badge.svg)](https://github.com/Bacon/BaconQrCode/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/Bacon/BaconQrCode/branch/master/graph/badge.svg?token=rD0HcAiEEx)](https://codecov.io/gh/Bacon/BaconQrCode)
+[![Latest Stable Version](https://poser.pugx.org/bacon/bacon-qr-code/v/stable)](https://packagist.org/packages/bacon/bacon-qr-code)
+[![Total Downloads](https://poser.pugx.org/bacon/bacon-qr-code/downloads)](https://packagist.org/packages/bacon/bacon-qr-code)
+[![License](https://poser.pugx.org/bacon/bacon-qr-code/license)](https://packagist.org/packages/bacon/bacon-qr-code)
+
+
+## Introduction
+BaconQrCode is a port of QR code portion of the ZXing library. It currently
+only features the encoder part, but could later receive the decoder part as
+well.
+
+As the Reed Solomon codec implementation of the ZXing library performs quite
+slow in PHP, it was exchanged with the implementation by Phil Karn.
+
+
+## Example usage
+```php
+use BaconQrCode\Renderer\ImageRenderer;
+use BaconQrCode\Renderer\Image\ImagickImageBackEnd;
+use BaconQrCode\Renderer\RendererStyle\RendererStyle;
+use BaconQrCode\Writer;
+
+$renderer = new ImageRenderer(
+    new RendererStyle(400),
+    new ImagickImageBackEnd()
+);
+$writer = new Writer($renderer);
+$writer->writeFile('Hello World!', 'qrcode.png');
+```
+
+## Available image renderer back ends
+BaconQrCode comes with multiple back ends for rendering images. Currently included are the following:
+
+- `ImagickImageBackEnd`: renders raster images using the Imagick library
+- `SvgImageBackEnd`: renders SVG files using XMLWriter
+- `EpsImageBackEnd`: renders EPS files