Add ability to remove Tooltip on outside touch event.

[Shubham7819]

Anyone knows how to remove ViewTooltip on outside touch event.

I want ViewTooltip to stay until any touch event occurs outside of its view area

i've tried workaround suggested in issue #16 , but it is not working as it supposed to for this case, it removes ViewTooltip even on inside touch
i've also tried setting flag FLAG_WATCH_OUTSIDE_TOUCH and watching for touch event using onTouchEvent() but it does not detect outside touches.