Fix "tipsy-ness" level selector on mobile

[Quaffel]

Fix adds the previously missing "touchmove" event listener to the selector's container. As the default input handling must be suppressed (Event#preventDefault), regular DOM event listeners are registered manually as React always uses passive event listeners (which are not allowed to invoke this function) for handling these events (PR).

If there's a more elegant/state-of-the-art solution, please let me know.

Resolves #16.

[Jonasdoubleyou]

Seems reasonable as long as facebook/react#6436 stays open.

[Jonasdoubleyou]

Assuming that setValue is stable, omitting onMove from dependencies is okay :) (another option would be to wrap onMove in a useCallback, but yeah, works this way too ...)

[Quaffel]

Haven't thought of this, thank you for the heads-up! The assumption that setValue is stable is quite fair to make, but using useCallback would have been better; you're right. I won't open a separate pull request for this though.