Making touchableopacity onPress work

[ToshKoevoets]

To make Touchable opacity work it's necessary to add some logic to the PanResponder.

Adding check on onMoveShouldSetPanResponder & onMoveShouldSetPanResponderCapture seems to work.

        ```
        const shouldStartDrag = (gs) => { return (Math.abs(gs.dx) > 2 || Math.abs(gs.dy) > 2)};

        this.panResponder = PanResponder.create({
            onMoveShouldSetPanResponder: (_, gestureState) =>
                shouldStartDrag(gestureState),
            onMoveShouldSetPanResponderCapture: (_, gestureState) =>
                shouldStartDrag(gestureState),

            onPanResponderMove: (e, gesture) => {
                const { pageX, pageY } = e.nativeEvent;
                this.props.__dndContext.handleDragMove(this.identifier, {
                    x: pageX,
                    y: pageY
                });
                this.moveEvent(e, gesture);
            },
            onPanResponderStart: e => {
                const { pageX, pageY } = e.nativeEvent;
                this.props.__dndContext.handleDragStart(this.identifier, {
                    x: pageX,
                    y: pageY
                });
            },
            onPanResponderRelease: e => {
                const { pageX, pageY } = e.nativeEvent;
                if (this.props.bounceBack) {
                    Animated.spring(this.state.pan, {
                        toValue: { x: 0, y: 0 }
                    }).start();
                }
                this.props.__dndContext.handleDragEnd(this.identifier, {
                    x: pageX,
                    y: pageY
                });
            }
        });
    }