modularize…

GTest.cmake
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			if(NOT _GTest_version)
			set(_GTest_version "master")
			endif()

			if(NOT EXISTS ${_GTest_external_dir})
			download_external_project(google-test
			URL "https://github.com/google/googletest.git"
			TAG "${_GTest_version}"
			BACKEND GIT
			THIRD_PARTY_SRC_DIR ${_GTest_external_dir}
			${_GTest_update}
			)
			endif()

			set(gtest_build_tests OFF CACHE INTERNAL "" FORCE)
			set(INSTALL_GTEST OFF CACHE INTERNAL "" FORCE)
			set(BUILD_GTEST ON CACHE INTERNAL "" FORCE)
			set(BUILD_GMOCK OFF CACHE INTERNAL "" FORCE)

			set(Python_ADDITIONAL_VERSIONS ${AKANTU_ITERATORS_PYTHON_MAJOR_VERSION})

			add_subdirectory(${_GTest_external_dir}/google-test)

			set_property(TARGET gtest_main PROPERTY CXX_STANDARD 14)
			set_property(TARGET gtest PROPERTY CXX_STANDARD 14)

			add_library(GTest::Main ALIAS gtest_main)
			add_library(GTest::GTest ALIAS gtest)

			mark_as_advanced(INSTALL_GTEST)
			mark_as_advanced_prefix(gtest)