Enable touchstart again for prefetching

[arvgta]

At the moment, the following line, which enables prefetching on touchstart is disabled, but will be re-enabled asap(when other bugs in the way are eliminated):

$(document).on("touchstart", selector, _prefetch); // ToDo - for touchscreens - same thing -> usage of "on" / "one" unclear

[arvgta]

Solved - in course of this release

• The observable speed on mobile phones is superb- best to be seen here!

With many thanks to Edin once more!