Preferences: Add default implementation for filtering

The default "matches" method now takes the widget and looks for all
child labels, checkboxes, push buttons and group boxes.
Because of that, the former "createWidget" method
can be called multiple times without creating a new widget
(-->widget()), and the "finished" method must ensure that the created
widget gets deleted, since not all widgets that were created are added
to the UI anymore.

Change-Id: Ia231c7c78dd8819146668e6447d36d22e7836904
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Utils: Remove superseded readFileUTF8 overload

Superseded by the version added in commit c1225ea.

Change-Id: I7cd8186b613b31e235d045f28e2b0f339784b59e
Reviewed-by: Eike Ziller <eike.ziller@digia.com>