Update build system, use CPM

[lefticus]

No description provided.

[codecov]

Codecov Report

Patch coverage: 57.89% and project coverage change: +0.88 🎉

Comparison is base (9145ad9) 63.97% compared to head (601cdc3) 64.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   63.97%   64.85%   +0.88%     
==========================================
  Files           8        9       +1     
  Lines         483      498      +15     
  Branches      282      279       -3     
==========================================
+ Hits          309      323      +14     
  Misses         99       99              
- Partials       75       76       +1     

Flag	Coverage Δ
Linux	52.73% <26.31%> (+0.79%)	⬆️
Windows	70.11% <100.00%> (ø)
macOS	52.29% <31.57%> (+30.53%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
include/json2cpp/json2cpp_adapter.hpp	58.62% <ø> (ø)
test/constexpr_tests.cpp	100.00% <ø> (ø)
test/tests.cpp	100.00% <ø> (ø)
src/main.cpp	40.00% <36.36%> (+12.72%)	⬆️
src/json2cpp.cpp	40.44% <50.00%> (+1.12%)	⬆️
include/json2cpp/json2cpp.hpp	69.41% <100.00%> (ø)
test/valijson_tests.cpp	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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