add .net core template and fixed project name number

Installers/VS2019/HandyControl_VS2019/HandyControl_VS2019.csproj

@@ -57,6 +57,10 @@
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
       <IncludeInVSIX>true</IncludeInVSIX>
     </Content>
+    <Content Include="ProjectTemplates\WpfCoreApp.zip">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      <IncludeInVSIX>true</IncludeInVSIX>
+    </Content>
     <None Include="source.extension.vsixmanifest">
       <SubType>Designer</SubType>
     </None>

Installers/VS2019/HandyControl_VS2019/source.extension.vsixmanifest

@@ -26,5 +26,6 @@
     <Assets>
         <Asset Type="Microsoft.VisualStudio.VsPackage" d:Source="Project" d:ProjectName="%CurrentProject%" Path="|%CurrentProject%;PkgdefProjectOutputGroup|" />
         <Asset Type="Microsoft.VisualStudio.ProjectTemplate" d:Source="File" Path="ProjectTemplates" d:TargetPath="ProjectTemplates\WpfApp.zip" />
+        <Asset Type="Microsoft.VisualStudio.ProjectTemplate" d:Source="File" Path="ProjectTemplates" d:TargetPath="ProjectTemplates\WpfCoreApp.zip" />
     </Assets>
 </PackageManifest>