Resolve "Forcibly changing `CMAKE_BUILD_TYPE` may affect parent project"

Closes #3

See merge request !2

Merge branch '2-cmake-fails-if-cmake_build_type-is-not-one-of-debug-release-minsizerel-and-relwithdebinfo' into 'main'

Resolve "CMake fails if `CMAKE_BUILD_TYPE` is not one of Debug, Release, MinSizeRel, and RelWithDebInfo"

Closes #2

See merge request !1