And make qquickviewcomparison able to demonstrate how to create a
partially transparent QQuickWidget.

Avoid also recreating the QQuickView/QQuickWidget multiple times
when switching between the radio buttons.

[ChangeLog] Added QQuickWidget::setClearColor() in order to support
semi-transparent QQuickWidgets.

Change-Id: I319ad4afbe909530274d09f2a7fcff23730d6ebd
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

Besides serving as a side-by-side test tool for QQuickView and
QQuickWidget (including multisampling), it also demonstrates some
useful practices for rendering 3D content via QQuickFramebufferObject.

Done-with: Paul Olav Tvete <paul.tvete@digia.com>
Change-Id: Ie73e998ee91e32ef1535dd6f0f65c8a69addcc5e
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>

I also cleaned up the naming of the other scene graph examples a bit,
so that they sort together in the samples list and have a more obvious
naming scheme.

Task-number: QTBUG-29548
Change-Id: I455eacb02c06058a6d49e12e4f1813ec80b655f6
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>

Change-Id: I6c3bd7bebe3d62d1cfd0fa6334544c9db8398c76
Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>

imageprovider is a QtQuick example. Models and Views examples are now split up,
as one is a collection of C++ examples and the other is banded into a single
QML example.

Task-Number: QTBUG-24133
Change-Id: I81874871bd69ffef6a88df84f3d3f649e0c56bc6
Reviewed-by: hjk <qthjk@ovi.com>

Change copyrights and license headers from Nokia to Digia

Change-Id: Ie7f5d49ed8235d7a7845ab68f99ad1c220e64d5c
Reviewed-by: Lars Knoll <lars.knoll@digia.com>