cleanup and fix build errors

src/ImageSharp/ImageSharp.csproj

@@ -10,8 +10,7 @@
     <VersionPrefix Condition="$(packageversion) != ''">$(packageversion)</VersionPrefix>
     <VersionPrefix Condition="$(packageversion) == ''">0.0.1</VersionPrefix>
 
-<!--    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;netstandard2.1;netstandard2.0;netstandard1.3;net472</TargetFrameworks>-->
-    <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;netstandard2.1;netstandard2.0;netstandard1.3;net472</TargetFrameworks>
 
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>

tests/ImageSharp.Benchmarks/Codecs/Jpeg/BlockOperations/Block8x8F_CopyTo1x1.cs

@@ -5,12 +5,15 @@ using System;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+
+#if SUPPORTS_RUNTIME_INTRINSICS
 using System.Runtime.Intrinsics;
 using System.Runtime.Intrinsics.X86;
+#endif
+
 using BenchmarkDotNet.Attributes;
 
 using SixLabors.ImageSharp.Formats.Jpeg.Components;
-using SixLabors.ImageSharp.Memory;
 
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg.BlockOperations

tests/ImageSharp.Benchmarks/Codecs/Jpeg/DecodeJpeg_ImageSpecific.cs

@@ -44,6 +44,7 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg
 
         private string TestImageFullPath => Path.Combine(TestEnvironment.InputImagesDirectoryFullPath, this.TestImage);
 
+        #pragma warning disable SA1115
         [Params(
             TestImages.Jpeg.BenchmarkSuite.Lake_Small444YCbCr,
             TestImages.Jpeg.BenchmarkSuite.BadRstProgressive518_Large444YCbCr,

tests/ImageSharp.Benchmarks/Codecs/Jpeg/YCbCrColorConversion.cs

@@ -11,7 +11,7 @@ using SixLabors.ImageSharp.Memory;
 
 namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg
 {
-    [Config(typeof(Config.ShortCore31))]
+    [Config(typeof(Config.ShortClr))]
     public class YCbCrColorConversion
     {
         private Buffer2D<float>[] input;

tests/ImageSharp.Benchmarks/Color/Bulk/FromVector4.cs

@@ -21,7 +21,7 @@ using SixLabors.ImageSharp.PixelFormats;
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Benchmarks.ColorSpaces.Bulk
 {
-    [Config(typeof(Config.ShortCore31))]
+    [Config(typeof(Config.ShortClr))]
     public abstract class FromVector4<TPixel>
         where TPixel : unmanaged, IPixel<TPixel>
     {

tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj

@@ -5,8 +5,7 @@
     <AssemblyName>ImageSharp.Benchmarks</AssemblyName>
     <OutputType>Exe</OutputType>
     <RootNamespace>SixLabors.ImageSharp.Benchmarks</RootNamespace>
-    <!-- <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks> -->
-    <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
     <GenerateProgramFile>false</GenerateProgramFile>
     <!--Used to hide test project from dotnet test-->
     <IsTestProject>false</IsTestProject>

tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj

@@ -8,8 +8,7 @@
     <Prefer32Bit>false</Prefer32Bit>
     <RootNamespace>SixLabors.ImageSharp.Tests.ProfilingSandbox</RootNamespace>
     <RuntimeIdentifier>win7-x64</RuntimeIdentifier>
-<!--    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>-->
-    <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
     <StartupObject>SixLabors.ImageSharp.Tests.ProfilingSandbox.Program</StartupObject>
     <!--Used to hide test project from dotnet test-->
     <IsTestProject>false</IsTestProject>

tests/ImageSharp.Tests/Common/SimdUtilsTests.cs

@@ -6,7 +6,6 @@ using System.Linq;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-using System.Runtime.Intrinsics;
 using SixLabors.ImageSharp.Common.Tuples;
 
 using Xunit;

tests/ImageSharp.Tests/ImageSharp.Tests.csproj

@@ -2,8 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-<!--    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>-->
-    <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <DebugSymbols>True</DebugSymbols>
     <AssemblyName>SixLabors.ImageSharp.Tests</AssemblyName>

tests/ImageSharp.Tests/ProfilingBenchmarks/JpegProfilingBenchmarks.cs

@@ -35,7 +35,7 @@ namespace SixLabors.ImageSharp.Tests.ProfilingBenchmarks
             { TestImages.Jpeg.BenchmarkSuite.ExifGetString750Transform_Huge420YCbCr, 5 }
         };
 
-        [Theory]
+        [Theory(Skip = ProfilingSetup.SkipProfilingTests)]
         [MemberData(nameof(DecodeJpegData))]
         public void DecodeJpeg(string fileName, int executionCount)
         {

tests/ImageSharp.Tests/ProfilingBenchmarks/ResizeProfilingBenchmarks.cs

@@ -21,7 +21,7 @@ namespace SixLabors.ImageSharp.Tests.ProfilingBenchmarks
 
         public int ExecutionCount { get; set; } = 50;
 
-        [Theory]
+        [Theory(Skip = ProfilingSetup.SkipProfilingTests)]
         [InlineData(100, 100)]
         [InlineData(2000, 2000)]
         public void ResizeBicubic(int width, int height)