Feature android touch updates

This lets you use the onScroll listener of android to detect scroll events in the horizontal or vertical direction.  Also passes down the velocity from the onFling event.  These functions are really useful for touch based camera movements. 
why is the one `swipe` method declaration separated from the other one? Also, could you mark this old method as deprecated using our [macro](https://github.com/openframeworks/openFrameworks/blob/a12fe3c2f673594d24e6f1ed58762b745d83b51d/libs/openFrameworks/utils/ofConstants.h#L34-L50)? Which one is deprecated, though, as the new one seems to call the old one, further below?