Add Vector2d to common.proto

Author: Soyka-zz

osi_common.proto

@@ -32,6 +32,19 @@ message Vector3d
     optional double z = 3;
 }
 
+///
+/// A cartesian 2D vector for positions, velocities or accelerations.
+/// Units are [m] for positions, [m/s] for velocities and [m/s^2] for accelerations.
+///
+message Vector2d
+{
+    /// The x coordinate
+    optional double x = 1;
+
+    /// The y coordinate
+    optional double y = 2;
+}
+
 ///
 /// A timestamp.
 /// Names and types of fields chosen in accordance with google/protobuf/timestamp.proto to allow a possible switch in the