json.hpp compiler errors when compiling on MSVC

[SahilAshar]

When compiling win32-lib on MSVC, \lib\include\mat\json.hpp throws warning C28020: The expression '0<=_Param_(1)&&_Param_(1)<=400-1' is not true at this call.: Lines: 14534, 14554, which is treated as an error.

This is a known issue and was fixed in Release 3.8.0 of the JSON library.

[maxgolov]

Please use pragma for now to disable the warning. We can consider upgrading dependency for the next release, assuming there is no push-back. It may require a few iterations for each product to register the usage of specific OSS library version.