GUI elements now respect render order + some minor distance comparison optimization

Subsurface/Source/GameSession/CrewManager.cs

@@ -157,6 +157,13 @@ namespace Barotrauma
             //new GUIImage(new Rectangle(-10, -5, 0, 0), character.AnimController.Limbs[0].sprite, Alignment.Left, frame);
         }
 
+        public void AddToGUIUpdateList()
+        {
+            guiFrame.AddToGUIUpdateList();
+            if (commander.Frame != null) commander.Frame.AddToGUIUpdateList();
+            if (crewFrameOpen) crewFrame.AddToGUIUpdateList();
+        }
+
         public void Update(float deltaTime)
         {
             guiFrame.Update(deltaTime);

Subsurface/Source/GameSession/GameModes/GameMode.cs

@@ -77,6 +77,8 @@ namespace Barotrauma
 
         public virtual void MsgBox() { }
 
+        public virtual void AddToGUIUpdateList() { }
+
         public virtual void Update(float deltaTime)
         {
             //if (!isRunning) return;

Subsurface/Source/GameSession/GameModes/Tutorials/TutorialMode.cs

@@ -27,6 +27,11 @@ namespace Barotrauma
 
         }
 
+        public override void AddToGUIUpdateList()
+        {
+            tutorialType.AddToGUIUpdateList();
+        }
+
         public override void Update(float deltaTime)
         {
             base.Update(deltaTime);

Subsurface/Source/GameSession/GameModes/Tutorials/TutorialType.cs

@@ -75,6 +75,11 @@ namespace Barotrauma.Tutorials
             CoroutineManager.StartCoroutine(UpdateState());
         }
 
+        public virtual void AddToGUIUpdateList()
+        {
+            if (infoBox != null) infoBox.AddToGUIUpdateList();
+        }
+
         public virtual void Update(float deltaTime)
         {
             if (character!=null)

Subsurface/Source/GameSession/GameSession.cs

@@ -360,6 +360,13 @@ namespace Barotrauma
             
         }
         
+        public void AddToGUIUpdateList()
+        {
+            if (gameMode != null) gameMode.AddToGUIUpdateList();
+
+            if (infoFrame != null)  infoButton.AddToGUIUpdateList();
+        }
+
         public void Update(float deltaTime)
         {
             TaskManager.Update(deltaTime);