Enhanced upload file type detection. If given an original filename, we'll attempt to detect type from the extension if we were unable to make a definitive match from content. Generic octet-stream, zip, and MS Office type are explicitly singled out for re-checks, which fixes OpenOffice and MS Office documents to come up with the proper types when misdetected.

File extensions can also be added to the upload type whitelist; they'll be normalized to types for the actual comparison, so only known extensions will work.

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