Qt3D depends upon qtimageformats for webp images used in examples

Change-Id: Ib6c6014fa8818f11acef798d645dca98a49b972b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Add some assets useful for examples

Change-Id: Ifbd5354b71e6d50009363a101f7fdcc16ec2a30c
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Add an example demonstrating more materials

Change-Id: I02c17262812fbfbd94287a0449027d985a2fe7ae
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>