Changes for Microsoft Visual C++ compiler (2022) compatibility

[torsten-pf]

• moved functions to SystemUtil.cpp to not include windows.h in other c++ files (preprocessor names collide)
• replaced pragmas pack(1)...pack(0) with pack(push, 1)...pack(pop) (pack(0) does not reset the alignment)
• variabe-length arrays are not supported
• _USE_MATH_DEFINES must be set before cmath inclusion to get macros like M_PI, M_PI_2, ...
• Tests: SDL requires "int main(int argc, char argv[])" instead of "int main(int argc, const char argv[])"

Right now all programs are running, but GUI elements (like checkboxes) do not show text

[torsten-pf]

I added a PR to Microsoft's STL implementation because it doesn't allow zero sigma in normal_distribution (https://github.com/microsoft/STL/pull/3596).

If this will be rejected: Is it possible to use a very small sigma value where it is needed?