Update for C++17 and fix MSVC warnings (#1694)

* Update MSVC arguments
* Fix json allocator
* Fix simulation diamond
* Bump gtest
* Remove empty varargs in unit tests
* Replace test case with test suite
* Remove deprecation warning in optional
* Remove need for NOMIXMAX to be defined in wpilib headers

wpiutil/src/main/native/cpp/llvm/Windows/Path.inc

@@ -41,6 +41,8 @@ typedef int errno_t;
 #ifdef _MSC_VER
 # pragma comment(lib, "shell32.lib")
 # pragma comment(lib, "ole32.lib")
+#pragma warning(push)
+#pragma warning(disable: 4244 4267 4146)
 #endif
 
 using namespace wpi;
@@ -963,3 +965,7 @@ std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
 } // end namespace windows
 } // end namespace sys
 } // end namespace wpi
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif

wpiutil/src/main/native/cpp/llvm/raw_ostream.cpp

@@ -11,6 +11,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifdef _WIN32
+#define _CRT_NONSTDC_NO_WARNINGS
+#endif
+
 #include "wpi/raw_ostream.h"
 #include "wpi/STLExtras.h"
 #include "wpi/SmallString.h"