Particle fixes/improvements:

- Fixed particles going through closed gaps (e.g. closed doors).
- Gaps can emit particles even if the target hull is full of water (-> water running into the sub through an already flooded room is more apparent).
- The air-only splash & waterdrop particles are not emitted if the target room is full of water.
- Fixed heavy water particles never moving upwards (even if the water is rushing into a room from a gap on the floor).

Barotrauma/BarotraumaClient/Source/Particles/Particle.cs

@@ -261,7 +261,7 @@ namespace Barotrauma.Particles
                     bool gapFound = false;
                     foreach (Gap gap in hullGaps)
                     {
-                        if (gap.IsHorizontal != (collisionNormal.X != 0.0f)) continue;
+                        if (gap.Open <= 0.0f || gap.IsHorizontal != (collisionNormal.X != 0.0f)) continue;
 
                         if (gap.IsHorizontal)
                         {