Ffmpeg-progress-yield

* Docs: add scufre as a contributor.

* Update readme.

* Add support to send ffmpeg log (not progress) to a different file.

* Disallow blank issues.

* Fix: Clear and print progress when tqdm is not available.

This relates two printing sequence:

(1) Print one decimal place after printing two decimal places

0.74/100 -> 0.8/100 (1 less character)

(2) Print 100/100 after printing decimal progress

99.74/100 -> 100/100 (2 less characters)

99.8/100 -> 100/100 (1 less character)

So clear the line first, and print progress, showing for a moment, and then repeat, finally a newline. :)

* Chore: One-liner progress when tqdm is not available.

* Make setup name PEP 625 compliant.

* Remove python 3.8, add 3.12, 3.13.

* Fix: ensure percentage is always in float.