Add CMake and port to Windows

[hydroo]

Adding a basic cmake file and Windows support.

• The change is trying to be minimally intrusive and follow the existing Makefile
• Optimization flags are only used for release builds, because the default debug flags for MSVC clash with /O2.
• Set default build type to Release, because Linux would otherwise not apply release flags.
• Clock resolution is a bit unstable on Windows (999-~100us), but good enough, I suppose

Build:

mkdir BUILD
cd BUILD
cmake .. [-DCMAKE_BUILD_TYPE=Release]
cmake --build . [--config Release]

Win Execute:

Release\stream_c.exe

Linux Execute:

./stream_c
./stream_f

Tested with: MSVC, Clang on Windows, GCC in WSL, Clang in WSL

[hydroo]

I removed the printf warning change and the .gitignore change to simplify the CL