improve and fix styles - add new clean grouped help output

[napalu]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 26.96629% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.61%. Comparing base (5f77ebb) to head (8e5eb11).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
v2/renderer.go	0.00%	25 Missing ⚠️
v2/goopt_internal.go	20.00%	16 Missing ⚠️
v2/help_parser.go	11.11%	15 Missing and 1 partial ⚠️
v2/goopt.go	65.21%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
- Coverage   79.93%   79.61%   -0.33%     
==========================================
  Files          88       88              
  Lines       13190    13247      +57     
==========================================
+ Hits        10543    10546       +3     
- Misses       1924     1978      +54     
  Partials      723      723              

Flag	Coverage Δ
v1	74.74% <ø> (ø)
v2	82.30% <26.96%> (-0.52%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
v2/parser_config_funcs.go	95.03% <100.00%> (+0.10%)	⬆️
v2/goopt.go	87.45% <65.21%> (-0.21%)	⬇️
v2/goopt_internal.go	74.57% <20.00%> (-0.45%)	⬇️
v2/help_parser.go	73.57% <11.11%> (-1.56%)	⬇️
v2/renderer.go	80.88% <0.00%> (-18.22%)	⬇️

Files with missing lines	Coverage Δ
v2/parser_config_funcs.go	95.03% <100.00%> (+0.10%)	⬆️
v2/goopt.go	87.45% <65.21%> (-0.21%)	⬇️
v2/goopt_internal.go	74.57% <20.00%> (-0.45%)	⬇️
v2/help_parser.go	73.57% <11.11%> (-1.56%)	⬇️
v2/renderer.go	80.88% <0.00%> (-18.22%)	⬇️

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