[AndyB] Convert PDF 1.2

Converts hot linked PDF documents to attachments.

Hot linked PDF document are those which a user pastes a PDF document URL into a message. These hot linked PDF documents over time become dead and the thread becomes useless as the PDF content is missing. This add-on prevents this problem because it will automatically convert hot linked PDF documents into attachments.

(Example of hot linked PDF document)
Посмотреть вложение 87946
(Example after post is saved)
[ATTACH...

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Now verifies downloaded file is a PDF file.

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