Multiple footer printing in help

[phlptp]

Fixes #1156

For option groups removes inheritance of the footer and help option, so those are not printed by default for option groups. It is still possible to set them again on the option group.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e4ee3af) to head (f3dab3c).
Report is 90 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #1161     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           17        17             
  Lines         4546      5044    +498     
  Branches         0      1024   +1024     
===========================================
+ Hits          4546      5044    +498     

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