wrap glfw init to avoid warnings in headless mode and display animated gif

[m-reuter]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.00%. Comparing base (8adfdd7) to head (921c368).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
whippersnappy/snap.py	27.27%	7 Missing and 1 partial ⚠️
whippersnappy/gl/utils.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   39.92%   40.00%   +0.07%     
==========================================
  Files          23       23              
  Lines        2124     2130       +6     
  Branches      327      327              
==========================================
+ Hits          848      852       +4     
- Misses       1175     1177       +2     
  Partials      101      101              

Flag	Coverage Δ
unittests	40.00% <25.00%> (+0.07%)	⬆️

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