[UI Light Explorer] Merge Light Lister into it and improve upon

[Kranos_Orphydian]

There is a bit of redundancy like in many other areas in 3ds Max on the light managing side. We need a unique robust, flexible and modern light manager/editor. For the sake of not creating additional dialog/floating windows this could be done at the Light Explorer level, which is already a mode of the Scene Explorer, and this means we are already getting rid of two additional windows. 

Light Lister is quite handy but seems rather an old tech. If you change the light selection for ex, the Light Lister does not update interactively. You Need to click Refresh to update the list. We are not able to select multiple lights in Light Lister to edit them at once. We are not able to isolate a light like in Maya Light Editor (link). The new improved Light Explorer should get over these limitations.

Light Explorer should get the few handy extra functionalities of Light Lister and improve upon surpassing its limitations. By now I've noticed that in the Light lister when you have light instances, they are all grouped in a single object because basically the settings you change on one of them will affect all of them. Also, when it comes to Arnold lights in Light Explorer, there is no Configurable Column to show the type of Arnold light (Skydome, disc etc.) unlike the Light Lister. Pls include these in Light Explorer.