Reorganize actor and smudge loading.

The actor and smudge definitions are now stored
as raw MiniYamlNodes in the map.  It is now the
responsibility of the consumers to parse these
into real objects.

OpenRA.Mods.Common/Traits/World/SmudgeLayer.cs

@@ -72,16 +72,27 @@ namespace OpenRA.Mods.Common.Traits
 			}
 
 			// Add map smudges
-			foreach (var s in w.Map.Smudges.Value.Where(s => smudges.ContainsKey(s.Type)))
+			foreach (var s in w.Map.SmudgeDefinitions)
 			{
+				var name = s.Key;
+				var vals = name.Split(' ');
+				var type = vals[0];
+
+				if (!smudges.ContainsKey(type))
+					continue;
+
+				var loc = vals[1].Split(',');
+				var cell = new CPos(Exts.ParseIntegerInvariant(loc[0]), Exts.ParseIntegerInvariant(loc[1]));
+				var depth = Exts.ParseIntegerInvariant(vals[2]);
+
 				var smudge = new Smudge
 				{
-					Type = s.Type,
-					Depth = s.Depth,
-					Sprite = smudges[s.Type][s.Depth]
+					Type = type,
+					Depth = depth,
+					Sprite = smudges[type][depth]
 				};
 
-				tiles.Add((CPos)s.Location, smudge);
+				tiles.Add(cell, smudge);
 			}
 		}