Add support for rendering tinted artwork.

OpenRA.Mods.Common/Traits/Buildings/FootprintPlaceBuildingPreview.cs

@@ -93,7 +93,7 @@ namespace OpenRA.Mods.Common.Traits
 				var pal = HasFlag(c.Value, PlaceBuildingCellType.LineBuild) ? linePalette : cellPalette;
 				var pos = wr.World.Map.CenterOfCell(c.Key);
 				var offset = new WVec(0, 0, topLeftPos.Z - pos.Z);
-				yield return new SpriteRenderable(tile, pos, offset, -511, pal, 1f, true);
+				yield return new SpriteRenderable(tile, pos, offset, -511, pal, 1f, true, true);
 			}
 		}