fixed std::min and std::max problem

[DevO2012]

fixed std::min and std::max problem because of min and max macros in win...

[vitaut]

Thanks for the PR. windows.h is a quite a mess, but I don't think that C++ Format should unconditionally define global macros that can affect it. The reason is that such macros can break other library's or user code when windows.h is included elsewhere. I think it should be up to the user to decide whether these macros are defined or not and they can be defined before including format.h or on a project level.