The new Uize.Widget.ListEditor module implements a widget that lets the user build and edit a simple list of string values.

This module implements a number of noteworthy features:

	items added by the user can be conformed before being added to the list using a configurable itemConformer function
	the list can be maintained in a sorted state by using the sort state property
	special handling is implemented for the keyboard's enter, escape, and delete keys
	the state of the widget's add and remove button child widgets is managed so they are only enabled when appropriate
	the combination of the add and remove behaviors provides for a sufficiently intuitive way to make edits to items in the list
	and more...

The Uize.Widget.ListEditor module is actually not an entirely new module, but rather an evolution of the Uize.Widget.TextInputAdder module. The Uize.Widget.TextInputAdder module has been replaced by the Uize.Widget.ListEditor module, and this change in not backwards compatible.

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