R1:2aecae4ede9d

Update phpqrcode from version 1.1.4 to 1.9.9

Summary:
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

Test Plan:
* Manually diff between…