Add stats() script function to gather QObject instances

[hluk]

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[codecov]

Codecov Report

❌ Patch coverage is 89.65517% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.91%. Comparing base (f821be5) to head (156d57c).
⚠️ Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
src/tests/tests.cpp	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3314      +/-   ##
==========================================
+ Coverage   79.87%   79.91%   +0.03%     
==========================================
  Files         231      231              
  Lines       28458    28512      +54     
==========================================
+ Hits        22732    22785      +53     
- Misses       5726     5727       +1     

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