Add an ability to show just one input by page

[andrewtelnov]

We have the functionality to show one question per page. However, for complex questions like matrices and dynamic panels, there can be dozens of questions contained within them, which doesn't display well on mobile devices.

This mode would allow users to navigate through all the questions in a matrix cell and in a dynamic panel one by one, rendering only one input cell question for matrices at a time. It should provide additional actions for adding new rows at the end of the last cell question in the matrix and deleting a row at the beginning of the first cell in the row.

Here is the example of this behavior, which could be used as a prototype.