Harden BizTalk maintenance workflow and add installer

src/BizTalkPlatformManagementTool.Setup/Program.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Windows.Forms;
+
+namespace BizTalkPlatformManagementTool.Setup
+{
+    internal static class Program
+    {
+        [STAThread]
+        private static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new MainForm(new InstallerEngine(AppDomain.CurrentDomain.BaseDirectory)));
+        }
+    }
+}