Use mpdf's own QR code generation instead #465

This drops the dependency of an external service in favor of MPDF's own
barcode library. Sizes are configured somewhat differently there, so the
settin

Use mpdf's own QR code generation instead #465

This drops the dependency of an external service in favor of MPDF's own
barcode library. Sizes are configured somewhat differently there, so the
setting has been renamed.

Obsolete language strings are removed in a follow-up commit

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Update mpdf dependency to version 8

Added support for PHP 7.3 and 7.4

This is a quick an dirty switch to the current MPDF devel version

This makes the plugin working on PHP 7.1 again, however I did not look
deeply in how much the API changed and just tried to quickly

This is a quick an dirty switch to the current MPDF devel version

This makes the plugin working on PHP 7.1 again, however I did not look
deeply in how much the API changed and just tried to quickly make the
whole thing work again.

I opted for a composer based install of the library to have the proper
dependencies installed. I also checked in the result to have the plugin
easily install via the extension manager.

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