Revert "remove setters on Mobile.{from,to}Cell. use SetLocation instead"

This reverts commit 911db3f.

Author: chrisforbes

OpenRA.Game/Traits/Activities/Move.cs

@@ -156,7 +156,7 @@ public override IActivity Tick( Actor self )
 			}
 			else
 			{
-				mobile.SetLocation( mobile.fromCell, nextCell.Value );
+				mobile.toCell = nextCell.Value;
 				var move = new MoveFirstHalf(
 					this,
 					Util.CenterOfCell( mobile.fromCell ),
@@ -350,7 +350,8 @@ protected override MovePart OnComplete( Actor self, Mobile mobile, Move parent )
 							mobile.Facing,
 							Util.GetNearestFacing( mobile.Facing, Util.GetFacing( nextCell.Value - mobile.toCell, mobile.Facing ) ),
 							moveFraction - moveFractionTotal );
-						mobile.SetLocation( mobile.toCell, nextCell.Value );
+						mobile.fromCell = mobile.toCell;
+						mobile.toCell = nextCell.Value;
 						return ret;
 					}
 					else
@@ -363,7 +364,7 @@ protected override MovePart OnComplete( Actor self, Mobile mobile, Move parent )
 					mobile.Facing,
 					mobile.Facing,
 					moveFraction - moveFractionTotal );
-				mobile.SetLocation( mobile.toCell, mobile.toCell );
+				mobile.fromCell = mobile.toCell;
 				return ret2;
 			}
 		}
@@ -378,7 +379,7 @@ public MoveSecondHalf( Move move, float2 from, float2 to, int fromFacing, int to
 			protected override MovePart OnComplete( Actor self, Mobile mobile, Move parent )
 			{
 				self.CenterLocation = Util.CenterOfCell( mobile.toCell );
-				mobile.SetLocation( mobile.toCell, mobile.toCell );
+				mobile.fromCell = mobile.toCell;
 				mobile.FinishedMoving(self);
 				return null;
 			}

OpenRA.Game/Traits/Mobile.cs

@@ -84,18 +84,20 @@ public int Altitude
 		public int2 fromCell
 		{
 			get { return __fromCell; }
+			set { SetLocation( value, __toCell ); }
 		}
 
 		[Sync]
 		public int2 toCell
 		{
 			get { return __toCell; }
+			set { SetLocation( __fromCell, value ); }
 		}
 
 		[Sync]
 		public int PathHash;	// written by Move.EvalPath, to temporarily debug this crap.
 
-		public void SetLocation(int2 from, int2 to)
+		void SetLocation(int2 from, int2 to)
 		{
 			if (fromCell == from && toCell == to) return;
 			RemoveInfluence();