Removed hardcoded 'Project' in tests

[bgloyer]

Closes #14

Not sure if you want all of these, but I changed it to use ${CMAKE_PROJECT_NAME} for the project.

Also mentioned that SourcesAndHeaders.cmake should be changed.

Nice template.

Pull Request Readiness Checklist

See details at CONTRIBUTING.md.

• [x] I agree to contribute to the project under modern-cpp-template (Unlicense) License.

• [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or other license that is incompatible with modern-cpp-template

• [x] The PR is proposed to proper branch

• [x] There is reference to original bug report and related work

• [x] There is accuracy test, performance test and test data in the repository, if applicable

• [x] The feature is well documented and sample code can be built with the project CMake

[codecov-commenter]

Codecov Report

Merging #15 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #15   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            1         1           
=========================================
  Hits             1         1           

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[filipdutescu]

@bgloyer good catch! Thank you very much for both your contribution and your appreciation!