Upgrade documentation regarding CMake & Tests

[piponazo]

As discussed at #2082 and #2080, I decided to spend some time reviewing the documentation regarding CMake and how to run the tests.

[codecov]

Codecov Report

Merging #2088 (6180c94) into main (99f363c) will decrease coverage by 0.21%.
The diff coverage is n/a.

❗ Current head 6180c94 differs from pull request most recent head 66efb86. Consider uploading reports for the commit 66efb86 to get more accurate results

@@            Coverage Diff             @@
##             main    #2088      +/-   ##
==========================================
- Coverage   62.08%   61.87%   -0.22%     
==========================================
  Files          96       96              
  Lines       19153    19059      -94     
  Branches     9798     9782      -16     
==========================================
- Hits        11891    11792      -99     
- Misses       4967     4984      +17     
+ Partials     2295     2283      -12     

Impacted Files	Coverage Δ
src/safe_op.hpp	69.23% <0.00%> (-27.65%)	⬇️
include/exiv2/slice.hpp	69.64% <0.00%> (-21.89%)	⬇️
include/exiv2/error.hpp	60.71% <0.00%> (-4.81%)	⬇️
src/utils.cpp	38.46% <0.00%> (-1.93%)	⬇️
include/exiv2/value.hpp	82.68% <0.00%> (-0.56%)	⬇️
src/enforce.hpp	75.00% <0.00%> (+2.77%)	⬆️
src/getopt.cpp	67.30% <0.00%> (+5.76%)	⬆️
include/exiv2/metadatum.hpp	88.88% <0.00%> (+16.16%)	⬆️

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[clanmills]

BTW, I agree with you that $ make is very familiar and the way in which most folks will build and test exiv2. Except for MSVC users on DOS.

Documenting everything with conan/cmake/ctest commands runs everywhere. It's early days to call make legacy. However, we can see the direction of the wind. I think @kmilos believes that we should discourage the use of make and other unix style tools.

[clanmills]

Thanks, that's really good. Can you update the trailer with the revision date and remove my name/email. If you wish, you can add your name. I did this as a courtesy, however it's quite unnecessary. Putting the revision date in the document is useful.

[piponazo]

I think I have covered all the points addressed by @kmilos . Please let me know if I forgot something