Using memory arena in the game that supports hot reload

Game/Game.vcxproj

@@ -84,6 +84,7 @@
     <ClCompile Include="game.cpp" />
     <ClInclude Include="Entity\Entity.h" />
     <ClInclude Include="Entity\EntityManager.h" />
+    <ClInclude Include="game.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">