Definition of the implementation

As part of the Boot2Qt image we need to include the following modules:

https://codereview.qt-project.org/#/admin/projects/qt/tqtc-qmlpreview

https://codereview.qt-project.org/#/admin/projects/qt/tqtc-qtquicktimeline

The Timeline and the QML live preview are introduced as part of the Qt Quick Designer NG project/initiative. 

We need them to be part of the Boot2Qt images in order to be able to target a Boot2Qt image/hardware directly from the Qt Quick Designer.

In the case of the timeline module, the module should also be part of the sysroot (if not already done as part of the build process).