Adding option to hide GUI window in CLI mode

[raivisdejus]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.69%. Comparing base (29e3a94) to head (2cacb20).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
buzz/widgets/application.py	50.00%	2 Missing ⚠️
buzz/buzz.py	0.00%	1 Missing ⚠️
buzz/cli.py	66.66%	1 Missing ⚠️
buzz/widgets/main_window.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #996      +/-   ##
==========================================
- Coverage   80.95%   80.69%   -0.27%     
==========================================
  Files          86       86              
  Lines        5047     5056       +9     
==========================================
- Hits         4086     4080       -6     
- Misses        961      976      +15     

Flag	Coverage Δ
Linux	79.70% <50.00%> (-0.27%)	⬇️
Windows	79.73% <50.00%> (-0.29%)	⬇️
macOS	80.51% <50.00%> (-0.27%)	⬇️

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