Add methods to touch.

[JohanLarsson]

• [x] void Touch.Tap(Point p)
• [x] IDisposable Touch.Down(Point p)
• [x] void Touch.Up();
• [x] void Touch.Move(Point p)

[ErikWahlstrom]

https://msdn.microsoft.com/en-us/library/windows/desktop/hh802881(v=vs.85).aspx

[JohanLarsson]

Maybe this can be used:

• https://docs.microsoft.com/en-us/windows/desktop/api/_input_touchinjection/
• https://docs.microsoft.com/en-us/windows/desktop/api/winuser/ns-winuser-tagpointer_touch_info
• https://social.technet.microsoft.com/wiki/contents/articles/6460.simulating-touch-input-in-windows-8-using-touch-injection-api.aspx

[JohanLarsson]