Backported vsync changes from new-netcode, WIP hull visibility culling

The hull culling functions are there, they just aren't being used right now because there are some annoying bugs.

Subsurface/Source/Items/Item.cs

@@ -40,6 +40,8 @@ namespace Barotrauma
         
         public Hull CurrentHull;
 
+        public bool Visible = true;
+
         public SpriteEffects SpriteEffects = SpriteEffects.None;
 
         //components that determine the functionality of the item
@@ -806,9 +808,9 @@ namespace Barotrauma
         {
             base.FlipX();
 
-            if (prefab.CanSpriteFlipX)
-            {
-                SpriteEffects ^= SpriteEffects.FlipHorizontally;
+            if (prefab.CanSpriteFlipX)
+            {
+                SpriteEffects ^= SpriteEffects.FlipHorizontally;
             }
 
             foreach (ItemComponent component in components)
@@ -819,10 +821,11 @@ namespace Barotrauma
 
         public override void Draw(SpriteBatch spriteBatch, bool editing, bool back = true)
         {
+            if (!Visible) return;
             Color color = (isSelected && editing) ? color = Color.Red : spriteColor;
             if (isHighlighted) color = Color.Orange;
 
-            SpriteEffects oldEffects = prefab.sprite.effects;
+            SpriteEffects oldEffects = prefab.sprite.effects;
             prefab.sprite.effects ^= SpriteEffects;
 
             if (prefab.sprite != null)
@@ -1076,6 +1079,21 @@ namespace Barotrauma
             }
         }
 
+        public virtual void UpdateHUD(Character character)
+        {
+            if (condition <= 0.0f)
+            {
+                FixRequirement.UpdateHud(this, character);
+                return;
+            }
+
+
+            foreach (ItemComponent ic in components)
+            {
+                ic.UpdateHUD(character);
+            }
+        }
+
         public List<T> GetConnectedComponents<T>(bool recursive = false)
         {
             List<T> connectedComponents = new List<T>();