Add radius boost for depth clouds on outline

[emilk]

Normal point clouds:

Depth cloud point clouds:

(looks carefully - the outlines have almost the same color as the background)

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[Wumpf]

@ picture: you could have clicked them to make it more obvious 😄. But they are way too subtle now in too many cases (or is our background "wrong" ;)) :/. We need to find a better compromise

[Wumpf]

still unhappy about the uniform buffer/binding groups here. But not a hill to die on! Looking good otherwise, the renames and cleanups are appreciated!

[Wumpf]

I started naming those by their field names and I think that's better practice than what we had before. I.e it would be DepthCloudDrawInstance::bind_group_opaque here. Not consistent across everywhere though, jury is still out on this ;)

[emilk]

I think you are in a better position to take a rename-pass over all of re_renderer