Add avoid parameter to the API

include/engine/api/route_parameters.hpp

@@ -81,6 +81,23 @@ struct RouteParameters : public BaseParameters
 
     RouteParameters() = default;
 
+    template <typename... Args>
+    RouteParameters(const bool steps_,
+                    const bool alternatives_,
+                    const GeometriesType geometries_,
+                    const OverviewType overview_,
+                    const boost::optional<bool> continue_straight_,
+                    std::vector<std::string> avoid_,
+                    Args... args_)
+        : BaseParameters{std::forward<Args>(args_)...}, steps{steps_}, alternatives{alternatives_},
+          number_of_alternatives{alternatives_ ? 1u : 0u}, annotations{false},
+          annotations_type{AnnotationsType::None}, geometries{geometries_}, overview{overview_},
+          continue_straight{continue_straight_}, avoid{std::move(avoid_)}
+    // Once we perfectly-forward `args` (see #2990) this constructor can delegate to the one below.
+    {
+    }
+
+    // Without avoid flags
     template <typename... Args>
     RouteParameters(const bool steps_,
                     const bool alternatives_,
@@ -92,7 +109,6 @@ struct RouteParameters : public BaseParameters
           number_of_alternatives{alternatives_ ? 1u : 0u}, annotations{false},
           annotations_type{AnnotationsType::None}, geometries{geometries_}, overview{overview_},
           continue_straight{continue_straight_}
-    // Once we perfectly-forward `args` (see #2990) this constructor can delegate to the one below.
     {
     }
 
@@ -138,6 +154,7 @@ struct RouteParameters : public BaseParameters
     GeometriesType geometries = GeometriesType::Polyline;
     OverviewType overview = OverviewType::Simplified;
     boost::optional<bool> continue_straight;
+    std::vector<std::string> avoid;
 
     bool IsValid() const
     {