LOS effect optimization/changes:

- Rendering the shadows instead of light volumes to avoid the expensive raycasts needed to calculate the light volume.
- The LOS shadows are now rendered in two passes (fully obscured + penumbra) instead of each convex hull taking up 2 passes.

TODO: fix linux

Barotrauma/BarotraumaClient/Source/Characters/CharacterHUD.cs

@@ -34,7 +34,7 @@ namespace Barotrauma
         {
             healthBar.Flash();
 
-            damageOverlayTimer = MathHelper.Clamp(amount * 0.1f, 0.2f, 5.0f);
+            damageOverlayTimer = MathHelper.Clamp(amount * 0.1f, 0.2f, 1.0f);
         }
 
         public static void AddToGUIUpdateList(Character character)