Touch events on SideSwipe prevent scrolling in ScrollView

When using SideSwipe in a `ScrollView`, touch events on SideSwipe are unconditionnally captured and prevent the screen from scrolling. The culprit seems to be:
```js
onStartShouldSetPanResponder: () => true,
```
It always makes SideSwipe the pan responder has soon has we touch it. SideSwipe should be a bit more lax about being the responder. Using the `shouldCapture` callback works fine for me:
```js
onStartShouldSetPanResponder: () => this.handleGestureCapture,
```

Start at the SideSwipe pan responder setup, especially onStartShouldSetPanResponder and the shouldCapture callback described in the issue. Reproduce SideSwipe inside a ScrollView, then verify that the screen scrolls while SideSwipe gestures still work.

Written by the indexing model from the issue text.