Add msbuild-based stage0 where possible (#4597)

* Add msbuild-based stage0 where possible

* Fix bash initialization script

* Windows Fixes

* Fix dotnet deb tool

build_projects/dotnet-cli-build/DotNetRestorePJ.cs

@@ -0,0 +1,59 @@
+// 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.
+
+namespace Microsoft.DotNet.Cli.Build
+{
+    public class DotNetRestorePJ : DotNetTool
+    {
+        protected override string Command 
+        { 
+            get { return "restore"; } 
+        } 
+ 
+        protected override string Args 
+        { 
+            get { return $"{GetVerbosity()} {GetFallbackSource()} {GetPackages()} {GetDisableParallel()}"; } 
+        } 
+ 
+        public string FallbackSource { get; set; } 
+ 
+        public string Packages { get; set; } 
+ 
+        public string Verbosity { get; set; } 
+ 
+        private string GetFallbackSource() 
+        { 
+            if (!string.IsNullOrEmpty(FallbackSource)) 
+            { 
+                return $"--fallbacksource {FallbackSource}"; 
+            } 
+ 
+            return null; 
+        } 
+ 
+        private string GetPackages() 
+        { 
+            if (!string.IsNullOrEmpty(Packages)) 
+            { 
+                return $"--packages {Packages}"; 
+            } 
+ 
+            return null; 
+        } 
+ 
+        private string GetVerbosity() 
+        { 
+            if (!string.IsNullOrEmpty(Verbosity)) 
+            { 
+                return $"--verbosity {Verbosity}"; 
+            } 
+ 
+            return null; 
+        } 
+ 
+        private string GetDisableParallel() 
+        { 
+            return "--disable-parallel"; 
+        } 
+    }
+}