Handle iOS 13 iPads correctly

[realModusOperandi]

Starting in the next release of iOS, iPads will identify themselves as macOS devices to websites in order to get the desktop version of webpages. However, we really do need to send it the mobile page, because the desktop version can only be played with a keyboard, and the on screen keyboard does not have arrow keys.

Possible solutions (easy to hard):

• Document somehow that iPad users must request the mobile site to play
• Figure out how to really detect an iPad and send them to the controls page
• Add the ability to show the touch controls on the desktop game screen