Merge branch 'laurie/FolderAndNamespaceChangeFixes' into laurie/Visualizers

tutorials/pick_and_place/Scripts/SourceDestinationPublisher.cs

-using RosMessageTypes.Geometry;
-using ROSGeometry;
-using Quaternion = UnityEngine.Quaternion;
+using Unity.Robotics.ROSTCPConnector;
+using Unity.Robotics.ROSTCPConnector.ROSGeometry;
 
 public class SourceDestinationPublisher : MonoBehaviour
 {

tutorials/pick_and_place/Scripts/TrajectoryPlanner.cs

 using System.Collections;
 using System.Linq;
-using RosMessageTypes.Geometry;
-
-using ROSGeometry;
-using Quaternion = UnityEngine.Quaternion;
-using RosImage = RosMessageTypes.Sensor.Image;
-using Transform = UnityEngine.Transform;
-using Vector3 = UnityEngine.Vector3;
+using Unity.Robotics.ROSTCPConnector;
+using Unity.Robotics.ROSTCPConnector.ROSGeometry;
 
 
 public class TrajectoryPlanner : MonoBehaviour

tutorials/ros_unity_integration/unity_scripts/RosPublisherExample.cs

 using RosMessageTypes.RoboticsDemo;
 using UnityEngine;
-using Random = UnityEngine.Random;
+using Unity.Robotics.ROSTCPConnector;
 
 /// <summary>
 /// 

tutorials/ros_unity_integration/unity_scripts/RosServiceExample.cs

-using System;
-using Debug = UnityEngine.Debug;
+using Unity.Robotics.ROSTCPConnector;
 
 public class RosServiceExample : MonoBehaviour
 {

tutorials/ros_unity_integration/unity_scripts/RosSubscriberExample.cs

 using UnityEngine;
+using Unity.Robotics.ROSTCPConnector;
 using RosColor = RosMessageTypes.RoboticsDemo.UnityColor;
 
 public class RosSubscriberExample : MonoBehaviour