Add classification for stand-up scooters

feat(vehicle classifications): add classification for stand-up scooters, motivated by possible NCAP target type

refers to issue #673

Signed-off-by: schmidtlorenz <107173594+schmidtlorenz@users.noreply.github.com>
Signed-off-by: Pierre R. Mai <pmai@pmsf.de>

Author: schmidtlorenz

osi_object.proto

@@ -865,6 +865,10 @@ message MovingObject
             // Vehicle is a wheelchair.
             //
             TYPE_WHEELCHAIR = 15;
+			
+            // Vehicle is a stand-up or kickboard scooter, including motorized versions.
+            //
+            TYPE_STANDUP_SCOOTER = 17;
         }
 
         //