Improving Profile Class (Save and Json methods + Unit tests)

[jonoomph]

Adding new Save() method to Profile class, and fix a bug with "description" getting dropped in Json() method. Added new unit tests for JSON and Save methods. Related to OpenShot/openshot-qt#5634 (new PR for Profile Editing UI)

[jonoomph]

Need simple way to set Project Profile from Project File

[codecov]

Codecov Report

Attention: Patch coverage is 98.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.84%. Comparing base (5022ce4) to head (178cae4).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/Profiles.cpp	96.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #975      +/-   ##
===========================================
+ Coverage    54.43%   54.84%   +0.40%     
===========================================
  Files          182      182              
  Lines        16581    16638      +57     
===========================================
+ Hits          9026     9125      +99     
+ Misses        7555     7513      -42     

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