New gesture interface

Up / Down goes to next / prev verb.
Double tap toggles between Study & Test mode
 - In Study mode the ColorMapView is hidden.
 - In Test mode the ColorMapView is visible and measuring your response time.
Right / Left shows solutions in Test Mode.
Tap & Hold on main view to expand ColorMapView (the tiny area is almost unclickable)

When you change from Study to Test, the timestamps are reseted to 0 and the list is rewind to the first verb.