Version 1.7.1

Changed

• Don't build tests if the standard CMake BUILD_TESTING variable is set to off.
• Now needs CMake 3.5.0 or greater.
• Update included catch2 framework to current version v2.13.8.
• Only enable clang-tidy make target if protobuf was found.
• Allow setting C++ version to compile with in CMake config.

Fixed

• Fixes undefined behaviour in float and double byteswap.
• Add missing includes of "config.hpp".
• Avoid narrowing conversion by doing an explicit static_cast.