Support text wrapping with `UIText` and `Text` components

It would be nice if text components supported text wrapping, where the width of the component could be restricted, but the height would grow, and overflowing text would move down a line.

Start by locating the UIText and Text components and reading their current layout behavior. Determine how a restricted width should affect line breaks and component height; done means overflowing text moves to subsequent lines while the component grows vertically.

Written by the indexing model from the issue text.