Major redraft

Features :
* Qt Mouse/Touch emulation
* Hands/Fingers handling
* Gestures

Each of these 3 features can be customized by having
a custom handler.

Default handlers are provided.

Qml elements created

* HandsMotionArea
* FingersMotionArea
* CircleLeapGestureArea
* SwipeLeapGestureArea
* ScreeTapLeapGestureArea
* KeyTapLeapGestureArea

Qt abstraction of Leap elements

* QtLeapHand
* QtLeapFinger
* QtLeapPointable
* QtLeapTool
* QtLeapGesture
* QtLeapCircleGesture
* QtLeapSwipeGesture
* QtLeapTapGesture
* QtLeapScreenTapGesture
* QtLeapKeyTapGesture

Examples provided for

* Touch emulation
* Mouse emulation