Improve contraption UI (in crystal caves)

Im finding the contraption pretty clunky to use. You can control it using the dialog, and this works pretty well. But also you can tap certain areas of the contraption and it will pick up a gem (maybe the one you tapped, but often it seems random). This tap feature ends up being annoying and too easy to do by accident My suggestion is to get rid of the tap access, so the only way to control it is via the dialog (1, 2, 3, Remove All, etc)