Don't override CMAKE_CXX_STANDARD set by parent projects #40
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When ADE used as a submodule, it overrides CMAKE_CXX_STANDARD set by parent project. E.g. parent projects defines CMAKE_CXX_STANDARD as 14 and during first cmake run it's applied, but during second cmake run ADE's value is used from cache. No needs to keep CMAKE_CXX_STANDARD in cache, because it may vary from project to project.