Overhaul resource layer logic:

* ResourceType trait has been removed.
* Simulation-related data is now defined on the
  ResourceLayer (which mods can subclass/replace).
* Support non-money resources by moving the resource
  values to the PlayerResources trait.
* Allow mods to disable the neighbour density override
  and instead always use the map-defined densities.
* Allow mods to define their own resource placement
  logic (e.g. allow resources on slopes) by subclassing
  (Editor)ResourceLayer.
* Improve ability to subclass/override ResourceRenderer
  by exposing more virtual methods.

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -91,6 +91,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new RemovePlaceBuildingPalette(),
 				new ReplaceShadowPalette(),
 				new ReplaceResourceValueModifiers(),
+				new RemoveResourceType(),
 			})
 		};