Add support to read from stream

[glensc]

I would like to use something like:

AtomicParsley - -T< add_10sec.mp4

or

cat add_10sec.mp4 | AtomicParsley - -T

I need to check only if the file has moov in the beginning of the file, so parse two atoms, and if it's there or not and close the file, so would not need to parse whole big mp4 file to detect if moov is in the beginning of the file.

so, I thought I feed AtomicParsley data until it prints out two first atoms and close the pipe.

[github-actions]

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