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Adds a new material choice for a physically based metal/roughness material. Options are available for setting the material base color, metalness and roughness. Internally this uses a clone of Qt's QMetalRoughMaterial class. We use a copy of the Qt class instead of relying on Qt's implementation as longer-term improvements (such as data defined base color) will require a re-implementation anyway. By using our own material we will avoid having two different code paths for the data-defined/ non-data defined scenarios.