Update the internal copy of phpqrcode from version 1.1.4 (2010100721) to version 1.9.9 (20130526).
Single reason is that it adds a lot of documentation which may come handy one day.
This more recent code is taken from https://sourceforge.net/p/phpqrcode/code/19/ which equals https://github.com/Darkflib/php-qrcode/blob/master/lib/merged/phpqrcode.php, with our two custom one-line patches still on top.

Closes T15878

• Manually diff between old downstream and slightly newer upstream version in a visual diff tool to review the changes.
• Go to http://phorge.localhost/settings/panel/multifactor/ and select "Add Auth Factor", select TOTP, click "Continue", still see a QR code properly rendered which works.