MSVC changes

Add support for compilation on x64 toolchain (x86 cl.exe was running out of heap space in vm.cpp)

Also took the opportunity to change compile optimisation from /Ox to /O2, as /O2 provides better optimisation than does /Ox

Also, we shouldn't be explicitely setting compiler tool defines (__cpp_lib_bitops), so remove that from types.h

3rdparty/yaml-cpp.vcxproj

@@ -22,6 +22,9 @@
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <PropertyGroup>
+    <PreferredToolArchitecture>x64</PreferredToolArchitecture>
+  </PropertyGroup>
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
   <ImportGroup Label="Shared">
@@ -40,6 +43,7 @@
   <ItemDefinitionGroup>
     <ClCompile>
       <ExceptionHandling>Sync</ExceptionHandling>
+      <Optimization Condition="'$(Configuration)|$(Platform)'=='Release|x64'">MaxSpeed</Optimization>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemGroup>