Make multitarget possible

[sensslen]

aDD MULTI-TARGETING SUPPORT

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.72%. Comparing base (713b42e) to head (6aadb1e).

Files with missing lines	Patch %	Lines
src/CommandLineUtils/Internal/ReflectionHelper.cs	16.66%	3 Missing and 2 partials ⚠️
...LineUtils/Conventions/OptionAttributeConvention.cs	80.00%	1 Missing and 2 partials ⚠️
src/CommandLineUtils/CommandLineApplication.cs	50.00%	0 Missing and 1 partial ⚠️
src/CommandLineUtils/Utilities/DotNetExe.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #591      +/-   ##
==========================================
- Coverage   79.93%   79.72%   -0.22%     
==========================================
  Files         120      121       +1     
  Lines        4017     4024       +7     
  Branches      872      872              
==========================================
- Hits         3211     3208       -3     
- Misses        618      628      +10     
  Partials      188      188              

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[sensslen]

@natemcmaster this PR now almost builds successfully. The only missing bit is that the strong naming does not properly work for .net framework - hence the tests fail. Since I have no knowledge on strong naming whatsoever, can you please help me fix this?