Add some ToString overrides to improve debug experience.

OpenRA.Game/CPos.cs

@@ -58,7 +58,13 @@ namespace OpenRA
 		public bool Equals(CPos other) { return Bits == other.Bits; }
 		public override bool Equals(object obj) { return obj is CPos && Equals((CPos)obj); }
 
-		public override string ToString() { return X + "," + Y; }
+		public override string ToString()
+		{
+			if (Layer == 0)
+				return X + "," + Y;
+
+			return X + "," + Y + "," + Layer;
+		}
 
 		public MPos ToMPos(Map map)
 		{

OpenRA.Game/Map/CellRegion.cs

@@ -50,6 +50,11 @@ namespace OpenRA
 			BottomRight = bottomRight.ToCPos(gridType);
 		}
 
+		public override string ToString()
+		{
+			return $"{TopLeft}->{BottomRight}";
+		}
+
 		/// <summary>Expand the specified region with an additional cordon. This may expand the region outside the map borders.</summary>
 		public static CellRegion Expand(CellRegion region, int cordon)
 		{

OpenRA.Game/Map/MapCoordsRegion.cs

@@ -67,6 +67,11 @@ namespace OpenRA
 			bottomRight = mapBottomRight;
 		}
 
+		public override string ToString()
+		{
+			return $"{TopLeft}->{BottomRight}";
+		}
+
 		public MapCoordsEnumerator GetEnumerator()
 		{
 			return new MapCoordsEnumerator(this);