Gesture support #684
Description
From a user today:
I also want you to implement swipe gestures. For example, if I want to customize a two-finger swipe-up gesture, its function could be to select the "Where am I?" button or to tell me what's ahead of me. A swipe-down could tell me what's behind me, and similarly for right and left, and so on. It should also allow me to customize the gesture for all functions. Meaning, when I press on the word "Customize Gesture" for a two-finger swipe-up, a list of the application's functions and capabilities appears. The same should be available for three-finger and even four-finger gestures (whether two, three, or four fingers).
Talkback itself uses some two fingered gestures, but as far as I can tell they're only from the home screen but some care would be required.