Clean up setting of C++ standard #462
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Added a 'bob' cmake helper function to set the C++ standard. The modifications do not change the default behavior of using C++11. The user is given the ability to increase the standard to > C++11, or enable the use of extensions, by passing CMAKE_CXX_STANDARD and CMAKE_CXX_EXTENSIONS, respectively, to cmake. Following approach given in "Professional CMake: 19th Edition".
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calling it more than once could be done if the standard was decreased, otherwise, the check against CMAKE_CXX_STANDARD will fail
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This PR adds a 'bob' cmake helper function to set the C++ standard. The modifications do not change the default behavior of using C++11. The user is given the ability to increase the standard to > C++11, or enable the use of extensions, by passing
CMAKE_CXX_STANDARDandCMAKE_CXX_EXTENSIONS, respectively, tocmake.Closes #448.