Add fired event when transitioning
Ensuring progressive apparition/disparition of fingers
Simplify move gesture: only 1 state
Fixup: Add fired event when transitioning

commit 5209f4cc97b556807b3dcdbb5221f53b29d4560c
Add NULL TouchEventType, simplify transitionTo() calls
Start gestures lazily, stop them early

This permits TIME events on the start state to work properly.

Simplified gestures.
scroll and zoom gestures will be soon merged and simplified.
Prevent JS errors after clicking close