add log switch and modify detector

Add an option to select whether to open log or not.
Add a detector to check whether the server setting changed.

shadowsocks-csharp/Controller/ShadowsocksController.cs

@@ -52,7 +52,7 @@ namespace Shadowsocks.Controller
 
             UpdateSystemProxy();
         }
-
+
         public Server GetCurrentServer()
         {
             return _config.GetCurrentServer();

shadowsocks-csharp/Program.cs

@@ -46,8 +46,8 @@ namespace Shadowsocks
                     Console.WriteLine(e.ToString());
                 }
                 LoadLibrary(dllPath);
-
-                Logging.OpenLogFile();
+
+                Logging.OpenLogFile();
                 Application.EnableVisualStyles();
                 Application.SetCompatibleTextRenderingDefault(false);
                 ShadowsocksController controller = new ShadowsocksController();

shadowsocks-csharp/View/ConfigForm.cs

@@ -373,5 +373,10 @@ namespace Shadowsocks.View
             qrCodeForm.Icon = this.Icon;
             qrCodeForm.Show();
         }
+
+        private void enableLogBox_CheckedChanged(object sender, EventArgs e)
+        {
+            MessageBox.Show("This option only works on next startup.");
+        }
     }
 }