Add AssignRouteAction to TrafficAction

This makes it possible to forward OpenSCENARIO XML's AssignRouteAction to
a traffic participant.

Fixes #896.

Signed-off-by: Thomas Bleher <thomas.tb.bleher@bmw.de>

Author: tbleher

osi_trafficcommand.proto

@@ -4,6 +4,7 @@ option optimize_for = SPEED;
 
 import "osi_version.proto";
 import "osi_common.proto";
+import "osi_route.proto";
 
 package osi3;
 
@@ -130,6 +131,10 @@ message TrafficAction
     //
     optional TeleportAction teleport_action = 12;
 
+    // A AssignRouteAction
+    //
+    optional AssignRouteAction assign_route_action = 13;
+
     //
     // \brief The action header
     //
@@ -687,4 +692,24 @@ message TrafficAction
         //
         optional Orientation3d orientation = 3;
     }
+
+    // \brief Assign Route Action
+    //
+    // This Action allows to assign a route to a traffic participant.
+    //
+    // \note This action is aligned with the AssignRouteAction of OpenSCENARIO
+    // 1.3, with the assumption that the scenario engine resolves the route
+    // (e.g. converting a "use shortest route" to a concrete route) before
+    // passing it to the traffic participant.
+    //
+    message AssignRouteAction
+    {
+        // The Action Header
+        //
+        optional ActionHeader action_header = 1;
+
+        // The route to be assigned to the traffic participant.
+        //
+        optional Route route = 2;
+    }
 }