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/http_parser.cpp

@@ -25,6 +25,10 @@
 #include <string.h>
 #include <limits.h>
 
+#ifdef _WIN32
+#pragma warning(disable : 4018 26451)
+#endif
+
 #ifndef ULLONG_MAX
 # define ULLONG_MAX ((uint64_t) -1) /* 2^64-1 */
 #endif