message: Made layout the split/start button for mobile.
  The previous setup with the standalone split button was too annoying to
  press on mobile. Now, the split button is gone and tapping on the
  timer/splits acts as the buttom that was removed. Also gives a bit more
  screen space for mobile as well.
diff: @@ -126,15 +126,14 @@ export class LiveSplit extends React.Component<{}, State> {
  marginBottom: "5px",
  }}
  >
  + <div onClick={(_) => this.onSplit()} style={{margin: "0px"}}>
  <AutoRefreshLayout
  getState={() => this.state.timer.readWith(
  (t) => this.state.layout.stateAsJson(t),
  )}
  />
  + </div>
  <div className="buttons">
  - <button onClick={(_) => this.onSplit()}>
  - <i className="fa fa-play" aria-hidden="true" />
  - </button>
  <div className="small">
  <button onClick={(_) => this.onUndo()}>
  <i className="fa fa-arrow-up" aria-hidden="true" /></button>
  