Use fetchcontent googletest #380
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…hat we use the namespaced target (and potentially avoid adding -lgtest_main to the command line)
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FetchContent was introduced in cmake 3.11, we require 3.14 and above. FetchContent is pretty much a drop-in replacement for our previous code.
I also switched the target we use to the namespaced target:
GTest::gtest_main. This is to avoid potential issues with accidentally adding-lgtest_mainto the command line and finding a system gtest_main in some situations.