Fixed bug in retrieving the player menu.

The PlayerMenu is actually not attached to the game object representing
the local player but to another game object that is a child of the
local player (e.g., DesktopPlayer in a desktop environment).
Now we retrieve the player menu by way of the new method LocalPlayer.TryGetPlayerMenu.

Assets/SEE/Game/LocalPlayer.cs

@@ -1,4 +1,5 @@
-using UnityEngine;
+using SEE.GO.Menu;
+using UnityEngine;
 
 namespace SEE.Game
 {
@@ -13,5 +14,30 @@ public static class LocalPlayer
         /// executing on this local instance of Unity.
         /// </summary>
         public static GameObject Instance;
+
+        /// <summary>
+        /// Returns the <see cref="PlayerMenu"/> attached to the local player <see cref="Instance"/>
+        /// or any of its descendants (including inactive ones).
+        /// </summary>
+        /// <param name="playerMenu">the resulting <see cref="PlayerMenu"/>; <c>null</c> if none
+        /// could be found</param>
+        /// <returns>true if a <see cref="PlayerMenu"/> could be found</returns>
+        internal static bool TryGetPlayerMenu(out PlayerMenu playerMenu)
+        {
+            if (Instance == null) 
+            {
+                Debug.LogError($"Local player is null'.\n");
+                playerMenu = null;
+                return false;
+            }
+            playerMenu = Instance.GetComponentInChildren<PlayerMenu>(includeInactive: true);
+            if (playerMenu == null)
+            {
+                Debug.LogError($"Couldn't find component '{nameof(PlayerMenu)}' "
+                               + $"on local player named '{Instance.name}'.\n");
+                return false;
+            }
+            return true;
+        }
     }
 }

Assets/SEE/GameObjects/Menu/PlayerMenu.cs

@@ -220,10 +220,10 @@ private void Update()
         /// <summary>
         /// Sets the currently selected menu entry in PlayerMenu to the action with given <paramref name="actionName"/>.
         /// </summary>
-        /// <param name="actionName">name of the menu entry to be </param>
+        /// <param name="actionName">name of the menu entry to be set</param>
         private static void SetPlayerMenu(string actionName)
         {
-            if (LocalPlayer.Instance.TryGetComponentOrLog(out PlayerMenu playerMenu))
+            if (LocalPlayer.TryGetPlayerMenu(out PlayerMenu playerMenu))
             {
                 // We cannot use PlayerActionHistory.Current here
                 playerMenu.modeMenu.ActiveEntry = playerMenu.modeMenu.Entries.First(x => x.Title.Equals(actionName));