Feature idea: playout command, like pviews but just for layout

A `playout` command might differ from `pviews` by:
1. Don't show full `-description`, just show class name and frame. Perhaps an flag to allow inclusion of a given property, if present.
2. Order the tree visually, top (minY) to bottom (maxY), left (minX) to right (maxX). Currently `pviews` shows things in breadth first of subview order (back-to-front) but this order can differ from visual order.
3. Show frames converted to the given root view, so all origins can be compared without reference to the parent's frame.

Alternatively, could make `pviews` do these biddings via flags.