PDF_Reader adding Direct Embed W/ Google Fallback render options. Related...

whthatrequested to merge
issue/pdf_reader-3577707:8.x-1.x into 8.x-1.x

PDF_Reader adding Direct Embed W/ Google Fallback render options. Related Twig, Accessibile Title tags, Media obsured URLs, Google Refresh JS, and Related phpunit tests of functionality.

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