xrGame: enable C++17 in project settings

Author: eagleivg

src/xrGame/xrGame.vcxproj

@@ -97,7 +97,7 @@
   </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
-      <LanguageStandard>stdcpp14</LanguageStandard>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">