Reimplementation of Sensor Display

[Spik3d]

I think we should have sensor display back (how it originally was).

I don't think I've ever kept up with updates and after a bit of searching, it seems like the sensor display has been changed from what it was originally, but now it's also disabled outside of debug mode. With how it is now, I'm fine with that, but I think we should have the original sensor display back. Where the "visible" terrain around all of our units and structures was highlighted.

[Per]

Not only is sensor display still there, it is now always on.

[Spik3d]

For the most part it is, but when you have the satellite uplink center, it's not. I was also thinking more of having it on highlight areas sensors can see (for artillery).