File\Pdf: remove obsolete code
Modules\Manager: no warning for duplicate modules

Formerly we logged a warning if a module was found in multiple module
paths. This is pointless, because as soon as you got a default module
installed by your distribution and "upgraded" it via your web frontend
this "error" will be the default. Logging at debug level right now.
layout-script: disable chrome translate suggestion

The way Chrome suggests translation is ugly and may result in a GUI
"jumping up and down". One more vendor specific meta attribute :(
layout/pdf: fix module css support

Containers need the correct module classes to get their correct CSS
also for PDFs
Pdf/Charts: add initial chart support to PDFs

Problem: TCPDF had SVG support, dompdf hasn't. This patch adds a
first rudimentary PNG conversion and a sample implementation making
use of such.