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cmake: redesign command-line argument parsing

Robert Maynard requested to merge robertmaynard/cmake:improve_cmakes_error_handling_of_bad_parameters into master

Refactoring cmake command line parsing

 "-S" -> valid
 "-S/path/to/source" -> valid
 "-S /path/to/source" -> valid
 "-S=/path/to/source" -> now valid

 "-D" -> invalid
 "-DStr" -> valid
 "-D Str" -> valid
 "-D=Str" -> now valid

 "--log-level=" -> invalid
 "--log-level" -> invalid
 "--log-level=2" -> valid
 "--log-level 2" -> now valid

Fixes: #21352 (closed)

Edited by Brad King

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