Use target_compile_features
to specify C++ standard requirement
#3205
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Closes #3189
I increase the minimum CMake version to 3.8 because that's when the
cxx_std_11
compile feature was added. Realistically this requirement could be increased to at least 3.10 since 3.10 is what Ubuntu 18 ships with and it's unlikely that any users are locked to an older CMake version than that.