Introduce CMake

[xorza]

Its very hard now to integrate any library to your project if it doesn't have CMakeLists.

I opened this PR to start discussion of nima-cpp migration to CMake. Currently I tested it with CMake 3.14, with gcc 7.4, clang 8.0 and MSVC 19.22

There were a lot of changes introduced to code to satisfy all compilers:

1. Cut out usage of M_PI, cause it is deprecated and doesn't even compile on MSVC without additional define. Instead I added MathUtils.hpp file to nima-math where I declared constexp nima::pi and piOver2
2. Fixed bunch of double -> float implicit casts with explicit and signed-unsigned comparisons to satisfy MSVC with W3 and WX
3. Normalized includes of nima-math headers: some of them used "" other <>.
4. Fixed compilation warning as error on Apple Clang 10.0.1 when catching exception by value instead of reference catch (const OverflowException &ex)
5. Removed makefiles
6. Updated gitignore for project to be usable with CLion, VSCode, VS19 Community

Lets start discussion and if overall you accept my changes I will open PR with changes against nima-math. Here you can see nima-math diff: 2d-inc/Nima-Math-Cpp@master...xorza:master