Use CMake 3.5 features 1. Set `cmake_minimum_required` to 3.5 (see https://cmake.org/cmake/help/latest/release/3.27.html) 2. Specify the version of CMake project 3. Remove the redundant call to `cmake_policy` 4. Use `CMAKE_INSTALL_BINDIR` and `CMAKE_INSTALL_INCLUDEDIR` 5. Use private library linking for tools and test programs 6. Don't activate testing if it was not enabled Signed-off-by: Cosmin Truta <ctruta@gmail.com>