Add translucent black circles behind star systems on the galaxy map

[ekolis]

What do you want to see? Add a circular fade to black effect around the star systems on the galaxy map.

How would it help players? Make star systems easier to see on the brighter parts of the map background

Alternatives Maybe?

Screenshots and mockups

Things to consider This is part of #287 .

[ekolis]

Or maybe we could just make the entire background dimmer...