Compiler silently falls back to older standards

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The CMakeLists.txt currently reads (line 9):

set(CMAKE_CXX_STANDARD 17)

When using an old compiler that does not support c++17, CMake will silently fall back to an older standard. This may lead to varying user-experience.

Consider setting CMAKE_CXX_STANDARD_REQUIRED as well as CMAKE_CXX_EXTENSIONS to ensure usage of c++17 (alongside a defined set of compiler extensions).