Remove non-client click messages.

The way it was handled was wrong and it was annoying. Needs to be
replaced with its own event type.

src/Windows/Perspex.Win32/WindowImpl.cs

@@ -311,20 +311,20 @@ namespace Perspex.Win32
 
                     break;
 
-                case UnmanagedMethods.WindowsMessage.WM_NCLBUTTONDOWN:
-                case UnmanagedMethods.WindowsMessage.WM_NCRBUTTONDOWN:
-                case UnmanagedMethods.WindowsMessage.WM_NCMBUTTONDOWN:
-                    e = new RawMouseEventArgs(
-                        WindowsMouseDevice.Instance,
-                        timestamp,
-                        _owner,
-                        msg == (int)UnmanagedMethods.WindowsMessage.WM_NCLBUTTONDOWN
-                            ? RawMouseEventType.LeftButtonDown
-                            : msg == (int)UnmanagedMethods.WindowsMessage.WM_NCRBUTTONDOWN
-                                ? RawMouseEventType.RightButtonDown
-                                : RawMouseEventType.MiddleButtonDown,
-                        new Point(0, 0), GetMouseModifiers(wParam));
-                    break;
+                ////case UnmanagedMethods.WindowsMessage.WM_NCLBUTTONDOWN:
+                ////case UnmanagedMethods.WindowsMessage.WM_NCRBUTTONDOWN:
+                ////case UnmanagedMethods.WindowsMessage.WM_NCMBUTTONDOWN:
+                ////    e = new RawMouseEventArgs(
+                ////        WindowsMouseDevice.Instance,
+                ////        timestamp,
+                ////        _owner,
+                ////        msg == (int)UnmanagedMethods.WindowsMessage.WM_NCLBUTTONDOWN
+                ////            ? RawMouseEventType.LeftButtonDown
+                ////            : msg == (int)UnmanagedMethods.WindowsMessage.WM_NCRBUTTONDOWN
+                ////                ? RawMouseEventType.RightButtonDown
+                ////                : RawMouseEventType.MiddleButtonDown,
+                ////        new Point(0, 0), GetMouseModifiers(wParam));
+                ////    break;
                 case UnmanagedMethods.WindowsMessage.WM_LBUTTONDOWN:
                 case UnmanagedMethods.WindowsMessage.WM_RBUTTONDOWN:
                 case UnmanagedMethods.WindowsMessage.WM_MBUTTONDOWN: