Fixed memory leaks caused by sinking everything

Sinking is done when object is attached to parent... Sinking everything
when Raw is set results into incrementing ref count for no reason, hence
memory leak...
g_object_ref and g_object_unref is just so random code that is not even
worth explaining why it's deleted

glib/Object.cs

@@ -134,9 +134,6 @@ public static Object GetObject(IntPtr o, bool owned_ref)
 					return obj;
 				}
 
-				if (!owned_ref)
-					g_object_ref (o);
-
 				obj = GLib.ObjectManager.CreateObject(o);
 			}
 			if (obj == null) {

glib/ToggleRef.cs

@@ -39,7 +39,6 @@ public ToggleRef (GLib.Object target)
 			gch = GCHandle.Alloc (this);
 			reference = target;
 			g_object_add_toggle_ref (target.Handle, ToggleNotifyCallback, (IntPtr) gch);
-			g_object_unref (target.Handle);
 		}
 
 		public bool IsAlive {

gtk/Object.custom

@@ -105,16 +105,11 @@
 			base.Dispose ();
 		}
 
-		[DllImport("libgobject-2.0-0.dll", CallingConvention=CallingConvention.Cdecl)]
-		private static extern void g_object_ref_sink (IntPtr raw);
-
 		protected override IntPtr Raw {
 			get {
 				return base.Raw;
 			}
 			set {
-				if (value != IntPtr.Zero)
-					g_object_ref_sink (value);
 				base.Raw = value;
 				if (value != IntPtr.Zero)
 					InternalDestroyed += NativeDestroyHandler;