Update Android port

Update Android port

* java/org/gnu/emacs/EmacsView.java (onGenericMotionEvent): Call
onGenericMotionEvent.
* java/org/gnu/emacs/EmacsWindow.java (Coordinate): New fields
`button' and `id'.
(<init>): Add new arguments to the construtor.
(whatButtonWasIt): Return 0 if the button state has not changed.
(buttonForEvent): New function.
(figureChange): Return the Coordinate object associated to
EVENT.  Determine whether or not EVENT was accompanied by a
change to the button state, and ascertain which button that was.
(motionEvent): New function.
(onGenericMotionEvent, onTouchEvent): Factor out touch and mouse
event delivery to motionEvent.