Add verbose logging to log every connection

Note:
- Added a configuration entry, user should add this
  by hand or reset from scratch.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

shadowsocks-csharp/Controller/ShadowsocksController.cs

@@ -68,6 +68,7 @@ namespace Shadowsocks.Controller
         public event EventHandler EnableStatusChanged;
         public event EventHandler EnableGlobalChanged;
         public event EventHandler ShareOverLANStatusChanged;
+        public event EventHandler VerboseLoggingStatusChanged;
         public event EventHandler TrafficChanged;
 
         // when user clicked Edit PAC, and PAC file has already created
@@ -212,6 +213,15 @@ namespace Shadowsocks.Controller
             }
         }
 
+        public void ToggleVerboseLogging(bool enabled)
+        {
+            _config.isVerboseLogging = enabled;
+            SaveConfig(_config);
+            if ( VerboseLoggingStatusChanged != null ) {
+                VerboseLoggingStatusChanged(this, new EventArgs());
+            }
+        }
+
         public void SelectServerIndex(int index)
         {
             _config.index = index;