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/AIObjectiveIdle.cs

@@ -132,7 +132,7 @@ namespace Barotrauma
             {
                 List<Hull> targetHulls = new List<Hull>(Hull.hullList);
                 //ignore all hulls with fires or water in them
-                targetHulls.RemoveAll(h => h.FireSources.Any() || (h.Volume/h.FullVolume)>0.1f);
+                targetHulls.RemoveAll(h => h.FireSources.Any() || h.WaterVolume / h.Volume > 0.1f);
                 if (!targetHulls.Any()) return null;
 
                 return targetHulls[Rand.Range(0, targetHulls.Count)].AiTarget;