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/Items/Components/Holdable/RepairTool.cs

@@ -250,7 +250,7 @@ namespace Barotrauma.Items.Components
             //steer closer if almost in range
             if (dist > range)
             {
-                Vector2 standPos = leak.isHorizontal ?
+                Vector2 standPos = leak.IsHorizontal ?
                     new Vector2(Math.Sign(item.WorldPosition.X - leak.WorldPosition.X), 0.0f)
                     : new Vector2(0.0f, Math.Sign(item.WorldPosition.Y - leak.WorldPosition.Y));