Tabbed editing#540

Instead of all column value inputs placed one below another in the editing modal, there should be an option to arrange them in tabs.

When a tab is saved, next tab opens. Also possible to click a tab label directly to go to certain tab.

Very useful for splitting larger amounts of columns to sets that are easier to manage, especially in use cases when there are obvious grouping possibilities for the columns anyway.

Probably in a basic implementation the tab label could not contain more than a couple of words if there were many tabs, but they could show the full label when hovering on them. More advanced implementations would allow longer labels, I guess usually this is done by having two rows of labels.