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/include/wpi/Path.h

@@ -22,6 +22,12 @@
 #include <iterator>
 #include <system_error>
 
+#ifdef _WIN32
+// Disable iterator deprecation warning
+#pragma warning(push)
+#pragma warning(disable : 4996)
+#endif
+
 namespace wpi {
 namespace sys {
 namespace path {
@@ -460,4 +466,8 @@ std::error_code widenPath(const Twine &Path8, SmallVectorImpl<wchar_t> &Path16);
 } // end namespace sys
 } // end namespace wpi
 
+#ifdef _WIN32
+#pragma warning(pop)
+#endif
+
 #endif