Remove sln in favor of MSBuild

src/Microsoft.Tye.Core/Microsoft.Tye.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
     <RootNamespace>Tye</RootNamespace>
     <AssemblyName>Microsoft.Tye.Core</AssemblyName>
     <PackageId>Microsoft.Tye.Core</PackageId>
@@ -12,8 +12,8 @@
 
   <ItemGroup>
     <PackageReference Include="KubernetesClient" Version="1.6.11" />
+    <PackageReference Include="Microsoft.Build" Version="16.5.0" />
     <PackageReference Include="semver" Version="2.0.6" />
-    <PackageReference Include="Sln" Version="0.3.0" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.20071.2" />
     <PackageReference Include="System.Commandline.Rendering" Version="0.3.0-alpha.20070.2" />
     <PackageReference Include="YamlDotNet" Version="8.0.0" />

src/Microsoft.Tye.Core/Pipeline.cs

@@ -40,7 +40,7 @@ namespace Microsoft.Tye
                 var type = kvp.Key;
                 var delegates = kvp.Value;
 
-                var method = pipeline.GetType().GetMethod("Register").MakeGenericMethod(type);
+                var method = pipeline.GetType().GetMethod("Register")!.MakeGenericMethod(type);
                 for (var i = 0; i < delegates.Count; i++)
                 {
                     method.Invoke(pipeline, new[] { delegates[i], });

src/Microsoft.Tye.Core/PublishProjectStep.cs

@@ -31,7 +31,7 @@ namespace Microsoft.Tye
             }
 
             var projectFilePath = Path.Combine(application.RootDirectory, project.RelativeFilePath);
-            var outputDirectory = Path.Combine(Path.GetDirectoryName(projectFilePath), "bin", "Release", project.TargetFramework, "publish");
+            var outputDirectory = Path.Combine(Path.GetDirectoryName(projectFilePath)!, "bin", "Release", project.TargetFramework, "publish");
 
             output.WriteDebugLine("Running 'dotnet publish'.");
             output.WriteCommandLine("dotnet", $"publish \"{projectFilePath}\" -c Release -o \"{outputDirectory}\"");

src/Microsoft.Tye.Hosting/Microsoft.Tye.Hosting.csproj

@@ -19,13 +19,13 @@
   <ItemGroup>
     <PackageReference Include="Bedrock.Framework" Version="0.1.38-alpha.gd25d5b37ad" />
     <PackageReference Include="FeatherHttp" Version="0.1.42-alpha.gf06a8747e7" />
+    <PackageReference Include="Microsoft.Build" Version="16.5.0" />
     <PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="3.1.0" />
     <PackageReference Include="Serilog.Extensions.Hosting" Version="3.0.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" />
-    <PackageReference Include="Sln" Version="0.3.0" />
     <PackageReference Include="System.IO.Pipelines" Version="4.7.0" />
-    <PackageReference Include="YamlDotNet" Version="8.0.0" />
     <PackageReference Include="System.Reactive" Version="4.3.2" />
+    <PackageReference Include="YamlDotNet" Version="8.0.0" />
   </ItemGroup>
 
   <ItemGroup>