Needed package corrections

Corrections due to:
1) 'GhostBehaviour' is inaccessible due to its protection level
2) Inconsistent accessibility: property type 'NetcodeWorld' is less
  accessible than property 'NetworkManager.NetcodeWorld' etc

Author: michalChrobot

com.unity.netcode.gameobjects/Editor/NetworkObjectEditor.cs

@@ -42,7 +42,7 @@ private static void OnApplicationStart()
         /// <param name="gameObject">The <see cref="GameObject"/> with the <see cref="GhostObject"/> component being removed.</param>
         private static void OnGhostObjectPreRemoval(GameObject gameObject)
         {
-            var ghostBehaviours = gameObject.GetComponentsInChildren<GhostBehaviour>();
+            var ghostBehaviours = gameObject.GetComponentsInChildren<NetworkObjectBridge>();
             for (int i = ghostBehaviours.Length - 1; i >= 0; i--)
             {
                 DestroyImmediate(ghostBehaviours[i], true);

com.unity.netcode.gameobjects/Runtime/Components/Helpers/NetworkObjectBridge.cs

@@ -13,7 +13,7 @@ namespace Unity.Netcode
 
     [DefaultExecutionOrder(GhostObject.ExecutionOrder + 1)]
     //BREAK --- Fix this on UNIFIED side 1st
-    public partial class NetworkObjectBridge : GhostBehaviour
+    internal partial class NetworkObjectBridge : GhostBehaviour
     {
         // DefaultExecutionOrder
         // TODO: Define a const for the value used on GhostObject and use that value

com.unity.netcode.gameobjects/Runtime/Core/NetworkManager.cs

@@ -1360,7 +1360,7 @@ private bool CanStart(StartType type)
         /// <summary>
         /// The world instance assigned to this NetworkManager instance.
         /// </summary>
-        public NetcodeWorld NetcodeWorld { get; internal set; }
+        internal NetcodeWorld NetcodeWorld { get; set; }
         internal void InitializeNetcodeWorld()
         {
             if (NetcodeWorld != null)