Add nuget package for SDL2

packages.config

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="sdl2" version="2.0.5" targetFramework="native" />
+  <package id="sdl2.redist" version="2.0.5" targetFramework="native" />
+</packages>

planetblupi.vcxproj

@@ -219,6 +219,7 @@
     <None Include="empty.cur" />
     <None Include="fill.cur" />
     <None Include="map.cur" />
+    <None Include="packages.config" />
     <None Include="wait.cur" />
   </ItemGroup>
   <ItemGroup>
@@ -241,5 +242,14 @@
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
+    <Import Project="packages\sdl2.redist.2.0.5\build\native\sdl2.redist.targets" Condition="Exists('packages\sdl2.redist.2.0.5\build\native\sdl2.redist.targets')" />
+    <Import Project="packages\sdl2.2.0.5\build\native\sdl2.targets" Condition="Exists('packages\sdl2.2.0.5\build\native\sdl2.targets')" />
   </ImportGroup>
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('packages\sdl2.redist.2.0.5\build\native\sdl2.redist.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\sdl2.redist.2.0.5\build\native\sdl2.redist.targets'))" />
+    <Error Condition="!Exists('packages\sdl2.2.0.5\build\native\sdl2.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\sdl2.2.0.5\build\native\sdl2.targets'))" />
+  </Target>
 </Project>

planetblupi.vcxproj.filters

@@ -198,6 +198,7 @@
     <None Include="data\config.def">
       <Filter>Data</Filter>
     </None>
+    <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="blupi-d.rc">