Create basic script to download "best" format of YT video

Known quirks:
if the best two formats are mp4 the FMT_LINE will have 2 lines in it;
it currently assumes the top two are webm and mp4, but this is a quick
fix I'll likely do in a later commit. (just swap the grep and tail -n
1)

We just force m4a as the audio but this may not be optimal; you can
get the audio formats and merging the two best may be the best
situation especailly for audio focused things like a music video or
something.

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