Disallow using new in Setup of GTEST

[97gamjak]

Fixes #147

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.30%. Comparing base (63966e4) to head (b33a6f4).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #148      +/-   ##
==========================================
+ Coverage   87.18%   87.30%   +0.11%     
==========================================
  Files          55       56       +1     
  Lines        1935     1953      +18     
==========================================
+ Hits         1687     1705      +18     
  Misses        248      248              

Flag	Coverage Δ
unittests	87.30% <100.00%> (+0.11%)	⬆️

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