[Lighting] Add a own track in scene editor for Direct DMX/Direct DMX automation

Hy Lighting Team,

since we have now a nice amount of direct dmx channels it would be great to add some automation for those. A own track in the editor would be easy to implement with a simple line to assign dirext dmx 1/2/3/... on/off state. I think this would be an easy and flexible way to get rid of request for gobo changes, motor movements, etc.