Non-abstract effects

[ferdnyc]

There were some issues with recent changes that caused SWIG to lose the definitions of all of our effect classes, making them abstract in the Python bindings. This PR brings them back to reality, and fixes the unit-test failures occurring in OpenShot due to the lack of openshot.Mask() in the bindings.

[ferdnyc]

I meant to courtesy-CC the primary author for this code — cc: @BrennoCaldato

[codecov]

Codecov Report

Merging #683 (fcfb633) into develop (6562824) will increase coverage by 0.00%.
The diff coverage is 33.33%.

@@           Coverage Diff            @@
##           develop     #683   +/-   ##
========================================
  Coverage    50.41%   50.41%           
========================================
  Files          155      155           
  Lines        13317    13315    -2     
========================================
- Hits          6714     6713    -1     
+ Misses        6603     6602    -1     

Impacted Files	Coverage Δ
src/EffectBase.cpp	18.75% <0.00%> (-0.40%)	⬇️
src/EffectBase.h	50.00% <0.00%> (ø)
src/TrackedObjectBBox.h	25.71% <ø> (ø)
src/TrackedObjectBBox.cpp	66.18% <62.50%> (-0.25%)	⬇️
src/TrackedObjectBase.cpp	33.33% <75.00%> (+8.33%)	⬆️
src/TrackedObjectBase.h	50.00% <100.00%> (+4.54%)	⬆️

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[ferdnyc]

Merging to fix our OpenShot CI runs.