Added C++/WinRT as nuget reference

Fix #7, close #10

Author: GurliGebis

NppShell.vcxproj

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.props')" />
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|ARM64">
       <Configuration>Debug</Configuration>
@@ -293,11 +294,14 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
     <Import Project="packages\Microsoft.Windows.ImplementationLibrary.1.0.230202.1\build\native\Microsoft.Windows.ImplementationLibrary.targets" Condition="Exists('packages\Microsoft.Windows.ImplementationLibrary.1.0.230202.1\build\native\Microsoft.Windows.ImplementationLibrary.targets')" />
+    <Import Project="packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
     <Error Condition="!Exists('packages\Microsoft.Windows.ImplementationLibrary.1.0.230202.1\build\native\Microsoft.Windows.ImplementationLibrary.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\Microsoft.Windows.ImplementationLibrary.1.0.230202.1\build\native\Microsoft.Windows.ImplementationLibrary.targets'))" />
+    <Error Condition="!Exists('packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', 'packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.props'))" />
+    <Error Condition="!Exists('packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\Microsoft.Windows.CppWinRT.2.0.230225.1\build\native\Microsoft.Windows.CppWinRT.targets'))" />
   </Target>
 </Project>

framework.h

@@ -12,10 +12,10 @@
 #include <Unknwn.h>
 
 // WinRT Header Files
-#include <winrt/base.h>
-#include <winrt/Windows.ApplicationModel.h>
-#include <winrt/Windows.Foundation.Collections.h>
-#include <winrt/Windows.Management.Deployment.h>
+#include "winrt/base.h"
+#include "winrt/Windows.ApplicationModel.h"
+#include "winrt/Windows.Foundation.Collections.h"
+#include "winrt/Windows.Management.Deployment.h"
 
 // Windows Implementation Library Header Files
 #include "wil\winrt.h"

packages.config

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="Microsoft.Windows.CppWinRT" version="2.0.230225.1" targetFramework="native" />
   <package id="Microsoft.Windows.ImplementationLibrary" version="1.0.230202.1" targetFramework="native" />
 </packages>