CMake: Raised required version to 3.5 #92
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CMake >= 4.0.0-rc1 removed compatibility with versions < 3.5 and errors out with such versions passed to cmake_minimum_required(). 3.5.0 has been released 9 years ago, so I'd assume it's available almost everywhere.
Furthermore at least 3.1 was already required, because that's the version, which introduced CXX_STANDARD{,_REQUIRED}.
Also remove the FATAL_ERROR part, which has been ignored since 2.6. and CMP0012 is now implicitly assumed to be NEW already.