Support mouse dragging

[Drarig29]

Could be cool to enable this (Toornament does it).

A track: https://github.com/kmturley/touch-scroll

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Related to #7

[qlaffont]

In fact, you can easely fix it with simple CSS :

.bracket-viewer {
  overflow-x: scroll;
  width: 100%;
}

[Drarig29]

No, I mean really dragging with your mouse. Like if you move the mouse while holding the click, it will drag the view.

[Drarig29]

Just try touch-scroll and you'll understand 😉