NEWT/Android: Add (soft) keyboard input. Complete the Android -> NEWT key translation. Minor fixes for mouse as well.

- AndroidNewtEventFactory
  - Android -> NEWT KeyCodes, leave out control keys like HOME, BACK, .. TBD ..
  - We don't consume the key event, in case we cannot map it,
    so the Android OS has a chance to handle the control keys.
  - Key-Release generates a Key Typed event.
  - Key/Mouse translate Android time-base (upTime) to Unix.

- AndroidWindow
  - set our onKeyListener, using above tranlator
  - setFocusable(true) and setFocusableInTouchMode(true) on our SurfaceView,
    otherwise no key event will be delivered.
    Note: 'requestFocus()' must also be called on the view for key input!

- Test: NEWTGearsES2Activity, which launches the soft key via:
     InputMethodManager mgr = (InputMethodManager) win.getAndroidView().getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
     mgr.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0); // shows keyboard ..
  and requests the focus of the view for input.

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