Remove Spectre.Console.Cli from repository

* Move Spectre.Console.Cli to its own repository
* Update build script to use Cake.Sdk and .NET Make
* Remove StyleCop (unmaintained)
* Add linting using dotnet format
* Fix generator which was broken
* Update dependencies

build.cs

@@ -0,0 +1,111 @@
+#:sdk Cake.Sdk@5.1.25296.94-beta
+
+var solution = "./src/Spectre.Console.slnx";
+var generatorSolution = "./resources/scripts/Generator/Generator.slnx";
+var testProject = "./src/Spectre.Console.Tests/Spectre.Console.Tests.csproj";
+
+////////////////////////////////////////////////////////////////
+// Arguments
+
+var target = Argument("target", "Default");
+var configuration = Argument("configuration", "Release");
+
+////////////////////////////////////////////////////////////////
+// Tasks
+
+Task("Clean")
+    .Does(ctx =>
+{
+    ctx.CleanDirectory("./.artifacts");
+});
+
+Task("Lint")
+    .Does(ctx =>
+{
+    ctx.DotNetFormat(solution, new DotNetFormatSettings
+    {
+        VerifyNoChanges = true,
+    });
+});
+
+Task("Build")
+    .IsDependentOn("Clean")
+    .IsDependentOn("Lint")
+    .Does(ctx =>
+{
+    ctx.DotNetBuild(solution, new DotNetBuildSettings
+    {
+        Configuration = configuration,
+        Verbosity = DotNetVerbosity.Minimal,
+        NoLogo = true,
+        NoIncremental = ctx.HasArgument("rebuild"),
+        MSBuildSettings = new DotNetMSBuildSettings()
+            .TreatAllWarningsAs(MSBuildTreatAllWarningsAs.Error)
+    });
+});
+
+Task("Test")
+    .IsDependentOn("Build")
+    .Does(ctx => 
+{
+    ctx.DotNetTest(testProject, new DotNetTestSettings {
+        Configuration = configuration,
+        Verbosity = DotNetVerbosity.Minimal,
+        NoLogo = true,
+        NoRestore = true,
+        NoBuild = true,
+    });
+});
+
+Task("Package")
+    .IsDependentOn("Test")
+    .Does(ctx =>
+{
+    ctx.DotNetPack(solution, new DotNetPackSettings
+    {
+        Configuration = configuration,
+        Verbosity = DotNetVerbosity.Minimal,
+        NoLogo = true,
+        NoRestore = true,
+        NoBuild = true,
+        OutputDirectory = "./.artifacts",
+        MSBuildSettings = new DotNetMSBuildSettings()
+            .TreatAllWarningsAs(MSBuildTreatAllWarningsAs.Error)
+    });
+});
+
+Task("Publish-NuGet")
+    .WithCriteria(ctx => BuildSystem.IsRunningOnGitHubActions, "Not running on GitHub Actions")
+    .IsDependentOn("Package")
+    .Does(ctx => 
+{
+    var apiKey = Argument<string?>("nuget-key", null);
+    if(string.IsNullOrWhiteSpace(apiKey)) {
+        throw new CakeException("No NuGet API key was provided.");
+    }
+
+    // Publish to GitHub Packages
+    foreach(var file in ctx.GetFiles("./.artifacts/*.nupkg")) 
+    {
+        ctx.Information("Publishing {0}...", file.GetFilename().FullPath);
+        DotNetNuGetPush(file.FullPath, new DotNetNuGetPushSettings
+        {
+            Source = "https://api.nuget.org/v3/index.json",
+            ApiKey = apiKey,
+        });
+    }
+});
+
+////////////////////////////////////////////////////////////////
+// Targets
+
+Task("Publish")
+    .IsDependentOn("Publish-NuGet");
+
+Task("Default")
+    .IsDependentOn("Package");
+
+////////////////////////////////////////////////////////////////
+// Execution
+
+RunTarget(target);