Added steering wheel angle

Signed-off-by: Nader Thomas <thomas.nader@bmw.de>

Author: ThomasNaderBMW

osi_object.proto

@@ -456,6 +456,13 @@ message MovingObject
         //
         repeated WheelData wheel_data = 7;
 
+        // Angle of the steering wheel. 
+        // 0=Central (Straight); Left>0; 0>Right.
+        //
+        // Unit: rad
+        //
+        optional double steering_wheel_angle = 8;
+
         // \brief Detailed wheel data.
         // The focus is on the description of a wheel regarding the perceivable 
         // information from the outside.