Bring Host build into separate project

build_projects/Microsoft.DotNet.Cli.Build.Framework/Reporter.cs

@@ -0,0 +1,58 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace Microsoft.DotNet.Cli.Build.Framework
+{
+    // Stupid-simple console manager
+    internal class Reporter
+    {
+        private static readonly Reporter Null = new Reporter(console: null);
+        private static object _lock = new object();
+
+        private readonly AnsiConsole _console;
+
+        private Reporter(AnsiConsole console)
+        {
+            _console = console;
+        }
+
+        public static Reporter Output { get; } = new Reporter(AnsiConsole.GetOutput());
+        public static Reporter Error { get; } = new Reporter(AnsiConsole.GetOutput());
+        public static Reporter Verbose { get; } = new Reporter(AnsiConsole.GetOutput());
+
+        public void WriteLine(string message)
+        {
+            lock (_lock)
+            {
+                _console?.WriteLine(message);
+            }
+        }
+
+        public void WriteLine()
+        {
+            lock (_lock)
+            {
+                _console?.Writer?.WriteLine();
+            }
+        }
+
+        public void Write(string message)
+        {
+            lock (_lock)
+            {
+                _console?.Writer?.Write(message);
+            }
+        }
+        
+        public void WriteBanner(string content)
+        {
+            string border = new string('*', content.Length + 6);
+            WriteLine($@"{border}
+*  {content}  *
+{border}".Green());
+        }
+    }
+}