Module brightness

A simple implementation of brightness/contrast

• brightness - float, between -1.0 and 1.0, 0.0 for no effect. Default 0.0
• contrast - positive float. 0.0 means zero contrast (grey), 1.0 means no change, >1 means increase contrast. Default 1.0
• mid - float, between -1.0 and 1.0. Mid-point for contrast. Default 0.0