Add new flag --use-ass-in-mkv

[moi15moi]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.10%. Comparing base (057bc2c) to head (33d0cc2).
⚠️ Report is 1 commits behind head on main.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   94.10%   94.10%           
=======================================
  Files          42       42           
  Lines        1798     1798           
=======================================
  Hits         1692     1692           
  Misses        106      106           

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