Update and clean up the authoring template and targets

This makes them more aligned with the SDK style.

Author: kzu

src/VisualStudio/NuGet.Packaging.VisualStudio.15/Templates/Projects/Nuget/Package/Package.nuproj

@@ -2,17 +2,8 @@
 <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 	<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
 	<Import Project="$(NuGetAuthoringPath)\NuGet.Packaging.Authoring.props" Condition="Exists('$(NuGetAuthoringPath)\NuGet.Packaging.Authoring.props')" />
-	<ItemGroup Label="ProjectConfigurations">
-		<ProjectConfiguration Include="Debug|AnyCPU">
-			<Configuration>Debug</Configuration>
-			<Platform>AnyCPU</Platform>
-		</ProjectConfiguration>
-		<ProjectConfiguration Include="Release|AnyCPU">
-			<Configuration>Release</Configuration>
-			<Platform>AnyCPU</Platform>
-		</ProjectConfiguration>
-	</ItemGroup>
-	<PropertyGroup Label="Configuration">
+
+	<PropertyGroup>
 		<PackageId>$safeprojectname$</PackageId>
 		<PackageVersion Condition="'$(PackageVersion)' == ''">1.0.0</PackageVersion>
 		<Title>$projectname$</Title>
@@ -24,17 +15,29 @@
 		<PackageProjectUrl></PackageProjectUrl>
 		<PackageLicenseUrl></PackageLicenseUrl>
 		<Copyright>Copyright © $username$</Copyright>
-    <PackageTags>$safeprojectname$</PackageTags>
-	</PropertyGroup>
-	<PropertyGroup Label="Globals">
+		<PackageTags>$safeprojectname$</PackageTags>
+
+		<RestoreProjectStyle>PackageReference</RestoreProjectStyle>
+		<TargetFramework>netstandard1.0</TargetFramework>
+		<PackageTargetFallback>net11;net20;net35;net40;net403;net45;net451;net452;net46;net461;net462;net47;netcore;netcore45;netcore451;netcore50;win8;win81;win10;sl4;sl5;wp;wp7;wp75;wp8;wp81;wpa81;uap;uap10;netstandard1.0;netstandard1.1;netstandard1.2;netstandard1.3;netstandard1.4;netstandard1.5;netstandard1.6;netstandard2.0;netcoreapp1.0;netcoreapp2.0;monoandroid;monotouch;monomac;xamarinios;xamarinmac;xamarinpsthree;xamarinpsfour;xamarinpsvita;xamarinwatchos;xamarintvos;xamarinxboxthreesixty;xamarinxboxone</PackageTargetFallback>
+
+		<Configurations>Debug;Release</Configurations>
+		<Platforms>AnyCPU</Platforms>
+		
+		<Configuration Condition="'$(Configuration)' == ''">Debug</Configuration>
 		<OutputPath>bin\$(Configuration)\</OutputPath>
 	</PropertyGroup>
+
+	<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'" />
+	<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|AnyCPU'" />
+
 	<ItemGroup>
 		<None Include="Readme.txt">
 			<IncludeInPackage>true</IncludeInPackage>
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 		</None>
 	</ItemGroup>
+
 	<Import Project="$(MSBuildToolsPath)\Microsoft.Common.targets" />
 	<Import Project="$(NuGetAuthoringPath)\NuGet.Packaging.Authoring.targets" Condition="Exists('$(NuGetAuthoringPath)\NuGet.Packaging.Authoring.targets')" />
 </Project>

src/VisualStudio/NuGet.Packaging.VisualStudio/Targets/NuGet.Packaging.Authoring.targets

@@ -16,8 +16,8 @@ Copyright (c) .NET Foundation. All rights reserved.
   <PropertyGroup>
     <ProjectSystemRulesDir Condition="'$(ProjectSystemRulesDir)' == ''">$(MSBuildThisFileDirectory)..\Rules\</ProjectSystemRulesDir>
     <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
-    <TargetFrameworkMoniker>NETFramework,Version=v1.0</TargetFrameworkMoniker>
-    <PackageTargetFallback>net11;net20;net35;net40;net403;net45;net451;net452;net46;net461;net462;netcore;netcore45;netcore451;netcore50;win8;win81;win10;sl4;sl5;wp;wp7;wp75;wp8;wp81;wpa81;uap;uap10;netstandard1.0;netstandard1.1;netstandard1.2;netstandard1.3;netstandard1.4;netstandard1.5;netstandard1.6;netcoreapp1.0;monoandroid;monotouch;monomac;xamarinios;xamarinmac;xamarinpsthree;xamarinpsfour;xamarinpsvita;xamarinwatchos;xamarintvos;xamarinxboxthreesixty;xamarinxboxone</PackageTargetFallback>
+    <TargetFramework>netstandard1.0</TargetFramework>
+    <PackageTargetFallback>net11;net20;net35;net40;net403;net45;net451;net452;net46;net461;net462;netcore;netcore45;netcore451;netcore50;win8;win81;win10;sl4;sl5;wp;wp7;wp75;wp8;wp81;wpa81;uap;uap10;netstandard1.0;netstandard1.1;netstandard1.2;netstandard1.3;netstandard1.4;netstandard1.5;netstandard1.6;netstandard2.0;netcoreapp1.0;netcoreapp2.0;monoandroid;monotouch;monomac;xamarinios;xamarinmac;xamarinpsthree;xamarinpsfour;xamarinpsvita;xamarinwatchos;xamarintvos;xamarinxboxthreesixty;xamarinxboxone</PackageTargetFallback>
   </PropertyGroup>
 
   <ItemGroup>
@@ -73,8 +73,6 @@ Copyright (c) .NET Foundation. All rights reserved.
     <!-- DependenciesTree capability lights up a Dependencies tree node and it's sub node providers-->
     <ProjectCapability Include="DependenciesTree" />
 
-    <ProjectCapability Include="ProjectConfigurationsInferredFromUsage" />
-
     <ProjectCapability Include="
                           AssemblyReferences;
                           ProjectReferences;