Fixed some inconsistencies and oddities in physics-handling code

I'm not sure if this fixes or breaks anything, but it's worth a shot.

Barotrauma/BarotraumaClient/Source/Items/Item.cs

@@ -470,7 +470,7 @@ namespace Barotrauma
             }
             else
             {
-                body.FarseerBody.Enabled = false;
+                body.Enabled = false;
             }
 
             if ((newPosition - SimPosition).Length() > body.LinearVelocity.Length() * 2.0f)

Barotrauma/BarotraumaShared/Source/Characters/Animation/FishAnimController.cs

@@ -78,7 +78,7 @@ namespace Barotrauma
             }
 
             //re-enable collider
-            if (!Collider.FarseerBody.Enabled)
+            if (!Collider.Enabled)
             {
                 var lowestLimb = FindLowestLimb();
 
@@ -87,7 +87,7 @@ namespace Barotrauma
                     Math.Max(lowestLimb.SimPosition.Y + (Collider.radius + Collider.height / 2), Collider.SimPosition.Y)),
                     0.0f);
 
-                Collider.FarseerBody.Enabled = true;
+                Collider.Enabled = true;
             }
 
             ResetPullJoints();

Barotrauma/BarotraumaShared/Source/Characters/Animation/HumanoidAnimController.cs

@@ -104,7 +104,7 @@ namespace Barotrauma
 
 
             //re-enable collider
-            if (!Collider.FarseerBody.Enabled)
+            if (!Collider.Enabled)
             {
                 var lowestLimb = FindLowestLimb();
                 
@@ -114,7 +114,7 @@ namespace Barotrauma
                     Collider.Rotation);
                 
                 Collider.FarseerBody.ResetDynamics();
-                Collider.FarseerBody.Enabled = true;
+                Collider.Enabled = true;
             }            
 
             if (swimming)

Barotrauma/BarotraumaShared/Source/Characters/Animation/Ragdoll.cs

@@ -1469,5 +1469,12 @@ namespace Barotrauma
             list.Remove(this);
         }
 
+        public static void RemoveAll()
+        {
+            for (int i = list.Count - 1; i >= 0; i--)
+            {
+                list[i].Remove();
+            }
+        }
     }
 }

Barotrauma/BarotraumaShared/Source/Items/Item.cs

@@ -1605,7 +1605,7 @@ namespace Barotrauma
             msg.Write(body.FarseerBody.Awake);
             if (body.FarseerBody.Awake)
             {
-                body.FarseerBody.Enabled = true;
+                body.Enabled = true;
                 msg.WriteRangedSingle(MathHelper.Clamp(body.LinearVelocity.X, -MaxVel, MaxVel), -MaxVel, MaxVel, 12);
                 msg.WriteRangedSingle(MathHelper.Clamp(body.LinearVelocity.Y, -MaxVel, MaxVel), -MaxVel, MaxVel, 12);
             }

Barotrauma/BarotraumaShared/Source/Map/Structure.cs

@@ -835,6 +835,7 @@ namespace Barotrauma
             {
                 StairDirection = StairDirection == Direction.Left ? Direction.Right : Direction.Left;
                 bodies.ForEach(b => GameMain.World.RemoveBody(b));
+                bodies.Clear();
 
                 CreateStairBodies();
             }

Barotrauma/BarotraumaShared/Source/Map/Submarine.cs

@@ -1208,9 +1208,9 @@ namespace Barotrauma
                 Item.ItemList.Clear();
             }
 
-            PhysicsBody.RemoveAll();
+            Ragdoll.RemoveAll();
 
-            Ragdoll.list.Clear();
+            PhysicsBody.RemoveAll();
 
             GameMain.World.Clear();