Changes to collider behavior

The collider now levitates above the ground, which makes small obstacles a non-issue. The raytest also helps the collider stick to staircases, so players don't jump off anymore.
Crouching now changes the collider to a smaller version, so now there is actual functionality to crouching.
I also removed the anchor from corpses of network players. I'm not entirely sure why this was done, but removing it doesn't seem to break anything.

Subsurface/Source/Networking/GameServer.cs

@@ -1165,7 +1165,7 @@ namespace Barotrauma.Networking
                 }
             }
 
-            CoroutineManager.StartCoroutine(EndCinematic());
+            CoroutineManager.StartCoroutine(EndCinematic(),"EndCinematic");
         }
 
         public IEnumerable<object> EndCinematic()