Subcommand fallthrough

[phlptp]

Add modifier for subcommands to restrict subcommands falling through to parent.
This will resolve #1022

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e4ee3af) to head (881a843).
Report is 41 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #1073     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           17        17             
  Lines         4546      4688    +142     
  Branches         0      1007   +1007     
===========================================
+ Hits          4546      4688    +142     

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[phlptp]

This also fixes some of the cmake build jobs that were failing from a recent update in that github action.

[phlptp]

Unless I hear some objections/suggestions I will merge this tomorrow morning.