Joe McGill 498f71615f Media: Keep PDF previews from overwriting files.
Since support for PDF previews were added in [38949], it's possible
that the generated image file could overwrite an existing image file
with the same name. This uses wp_unique_filename() to avoid this
issue and adds a '-pdf' identifier on the end of filenames.

Props gitlost, desrosj, mikeschroder, joemcgill.
Merges [40130] and [40131] to the 4.7 branch.
Fixes #39875. See #31050.

Built from https://develop.svn.wordpress.org/branches/4.7@40133


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