Add support for setting target directory

Includes some enhancements and updates on how arguments/options are
parsed.

Passing `-d /target/dir` you can specify an output directory:

`./yt-dlp-best -d /home/$USER/Videos/ 'https://example.com?my=video'`

The file will first be written to a temporary directory (leveraging
mktemp if available on the system; else a default directory created in
/tmp/) then moved to your target directory.

This will allow for targetting a slower / networked drive and avoid
both the video & audio write and merge happening over the networked
disk.

Future improvement would be to add a -t to allow passing in a specific
temp dir.

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