Support file extensions .jpeg and .heic in addition to .jpg

2.2 just changes how file extensions are handled. It SHOULD now work on HEIC images without first renaming to .jpg.

Preserve timestamps

This release now copies the creation and last modification timestamps of the original file to the extracted files. It also adds a new command line option, -r, which renames the original file to ${FILENAME}_original and doesn't append anything to the names of the extracted files. It can be combined with the existing -d flag to delete the original too, leaving only the photo and video with the original name.

Multilanguage support!

I've moved this from the old Gist to a repository since it has more files now, and a proper build process. Also new is quiet/batch operation (-q), delete original file in the same build as normal (-d), and a Chinese translation. Apart from that, it works exactly the same as the old one.