Water flow logic tweaking:

- Less fluctuation, water doesn't constantly flow back and forth through gaps.
- Flowing water pushes characters around much more heavily, and the force is applied to the collider in addition to the limbs.
- Vertical gaps don't push characters up/down unless the character is roughly above/below the gap.

+ Renamed some fields in the hull and gap classes (Volume -> WaterVolume, FullVolume -> Volume, public fields start with a capital letter)

Barotrauma/BarotraumaShared/Source/Characters/AI/Objectives/AIObjectiveFindSafety.cs

@@ -137,7 +137,7 @@ namespace Barotrauma
             if (currentHull == null) return true;
 
             //there's lots of water in the room -> get a suit
-            if (currentHull.Volume / currentHull.FullVolume > 0.5f) return true;
+            if (currentHull.WaterVolume / currentHull.Volume > 0.5f) return true;
 
             if (currentHull.OxygenPercentage < 30.0f) return true;
 
@@ -185,7 +185,7 @@ namespace Barotrauma
         {
             if (hull == null) return 0.0f;
 
-            float waterPercentage = (hull.Volume / hull.FullVolume) * 100.0f;
+            float waterPercentage = (hull.WaterVolume / hull.Volume) * 100.0f;
             float fireAmount = 0.0f;
 
             var nearbyHulls = hull.GetConnectedHulls(3);