Add ObjectInstances.findQuickWindow and passive-instrumenter exampleHEADmaster

This is a means of instrumenting any pure-QML application to generate an
object diagram showing the items and related objects belonging to the
first top-level window that can be found.

Using a Timer for that is kindof crude; perhaps we should rather
have a separate WindowFinder object that can emit a signal when a
new top-level window is discovered, or something like that. Or use
a Shortcut to trigger it manually. But it works well enough for now.

Change-Id: Ib2d82dfd6fbd4da4b46fbaadb08de2c5e649ffe6
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

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