Added --remove-effects feature to otiotool.

[jminor]

Sometimes you have effects in your timeline that you want to remove. This PR adds a --remove-effects option to otiotool to make that easy and convenient.

Example:

otiotool -i effects.otio --remove-effects -o no-effects.otio

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.95%. Comparing base (c0e97b0) to head (353e71b).
⚠️ Report is 106 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1912      +/-   ##
==========================================
+ Coverage   84.11%   84.95%   +0.83%     
==========================================
  Files         198      181      -17     
  Lines       22241    13073    -9168     
  Branches     4687     1209    -3478     
==========================================
- Hits        18709    11106    -7603     
+ Misses       2610     1781     -829     
+ Partials      922      186     -736     

Flag	Coverage Δ
py-unittests	84.95% <100.00%> (+0.83%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...-opentimelineio/opentimelineio/console/otiotool.py	64.45% <100.00%> (-1.86%)	⬇️
tests/test_console.py	95.50% <100.00%> (+0.17%)	⬆️

... and 136 files with indirect coverage changes

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[ssteinbach]

LGTM. Is the removal of -O otio_json in the test just to remove the explicit .json output?

[jminor]

@ssteinbach yes, those -O otio_json options were redundant. That is automatically inferred from the file extension. I just cleaned that up while I was in there so folks wouldn't think that's required.