Mobile support

[mindplay-dk]

I only tried the image zoom and splitter demos, but neither of these work on mobile, and probably won't work on tablets.

The whole project likely needs testing and optimization for touch input?

In many cases, this isn't going to be simple or elegant and will likely increase the complexity of some of these demos substantially, which might be harmful to the learning process for some, so there is that to consider.

Mobile support in some cases could be an additional section, so those who don't need it can skip it - and in some other cases, mobile support isn't really possible or intended, so it might be a good idea for every demo to indicate clearly (perhaps with icons) which device types it intends to support.

[phuocng]

@mindplay-dk Thanks for the suggestion 👍. To me, it's actually a known problem because I always check every posts on my iPhone :) I have plan to add more posts about supporting touch and wheel events soon. You'll see them soon.