Require cmake minimum version 3.4 on all platforms #200
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This PR updates the minimum required cmake to 3.4 on all platforms. Older cmake can be causing some problems without proper setting of cmake policies. For example, on macOS the variables
CMAKE_C_COMPILER_IDandCMAKE_CXX_COMPILER_IDare set toClanginstead ofAppleClang.There are also a few minor whitespace changes for readability.
Closes #198