This example shows the customization of Qt Quick Controls by
implementing a simple file system explorer. Using a C++ model, entries
are visualized in a TreeView, and text files can be read.
Fixes: QTBUG-108289
Change-Id: I966dcf65e40d3b727889dc14c65edd0ffcc1b878
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>