Avoid all highways listed in the avoid set

Even though the speeds are defined for a certain road class, routing should
be avoided as it is listed in the `avoid set`.

profiles/car.lua

@@ -356,6 +356,7 @@ function process_way(profile, way, result, relations)
     -- routable. this includes things like status=impassable,
     -- toll=yes and oneway=reversible
     WayHandlers.blocked_ways,
+    WayHandlers.avoid_ways,
 
     -- determine access status by checking our hierarchy of
     -- access tags, e.g: motorcar, motor_vehicle, vehicle

profiles/lib/way_handlers.lua

@@ -490,6 +490,15 @@ function WayHandlers.weights(profile,way,result,data)
   end
 end
 
+
+-- handle general avoid rules
+
+function WayHandlers.avoid_ways(profile,way,result,data)
+  if profile.avoid[data.highway] then
+    return false
+  end
+end
+
 -- handle various that can block access
 function WayHandlers.blocked_ways(profile,way,result,data)