Unload other versions of a module when loading

[gilesknap]

• adds a module unload so that multiple versions of the same module cannot be loaded at the same time
  • this fixes an issue with clashing of environment between two versions of the same module
• adds p47 and i13-1 to demonstrate the above feature

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.63%. Comparing base (fd50e1c) to head (ae81dd7).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   75.63%   75.63%           
=======================================
  Files          24       24           
  Lines         911      911           
=======================================
  Hits          689      689           
  Misses        222      222           

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