Parse set() options correctly

[AutonomicPerfectionist]

Is this pull request associated with an issue(s)?
Fixes #155

Description
This PR completely redesigns the set() command processor. It parses the parameters to the call according to https://cmake.org/cmake/help/latest/command/set.html. Notes are generated for certain options like PARENT_SCOPE or CACHE.

TODOs

• Generate notes for parsed options
• Add tests for many different variations of set()
• Probably refactor the option() processor

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5155867) 97.17% compared to head (30d38aa) 97.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
+ Coverage   97.17%   97.27%   +0.09%     
==========================================
  Files           8        8              
  Lines         992     1028      +36     
==========================================
+ Hits          964     1000      +36     
  Misses         28       28              

Flag	Coverage Δ
unittests	97.27% <100.00%> (+0.09%)	⬆️

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