Remove patch version from namespace

[darbyjohnston]

Fixes #1978

This PR removes the patch version from the OTIO namespace. As pointed out in #1978, patch versions shouldn't change the API, but we were making every release unique by including the patch number in the API itself.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.15%. Comparing base (a71b292) to head (9d11d0d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1979      +/-   ##
==========================================
+ Coverage   85.13%   85.15%   +0.01%     
==========================================
  Files         181      181              
  Lines       12783    12783              
  Branches     1206     1206              
==========================================
+ Hits        10883    10885       +2     
+ Misses       1717     1715       -2     
  Partials      183      183              

Flag	Coverage Δ
py-unittests	85.15% <ø> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
src/opentime/errorStatus.cpp	55.55% <ø> (ø)
src/opentime/errorStatus.h	100.00% <ø> (ø)
src/opentime/rationalTime.cpp	84.76% <ø> (ø)
src/opentime/rationalTime.h	95.83% <ø> (ø)
src/opentime/stringPrintf.h	57.14% <ø> (ø)
src/opentime/timeRange.h	98.38% <ø> (ø)
src/opentime/timeTransform.h	100.00% <ø> (ø)
src/opentimelineio/algo/editAlgorithm.cpp	0.00% <ø> (ø)
src/opentimelineio/anyDictionary.h	96.61% <ø> (ø)
src/opentimelineio/anyVector.h	90.32% <ø> (ø)
... and 55 more

... and 1 file with indirect coverage changes

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[darbyjohnston]

@reinecke Thinking about this after the meeting, I just wanted to call out that this PR does change the API by replacing OPENTIMELINEIO_VERSION with OPENTIMELINEIO_VERSION_NS.

So if people are using this in their C++ code:

namespace otio = opentimelineio::OPENTIMELINEIO_VERSION;

They will have to update it to this:

namespace otio = opentimelineio::OPENTIMELINEIO_VERSION_NS;

We provide the OTIO_NS macro as a shortcut, which hopefully most people are using, but not everyone might know about it. I wasn't sure how to fix this without making this change, so I'm open to any other ideas.

[darbyjohnston]

We discussed this at the TSC meeting today so I'm going to go ahead and merge it...