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/Components/Machines/Reactor.cs

@@ -438,7 +438,6 @@ namespace Barotrauma.Items.Components
             int x = GuiFrame.Rect.X;
             int y = GuiFrame.Rect.Y;
 
-            GuiFrame.Update(1.0f / 60.0f);
             GuiFrame.Draw(spriteBatch);
 
             float xOffset = (graphTimer / (float)updateGraphInterval);
@@ -481,6 +480,11 @@ namespace Barotrauma.Items.Components
             //y = y - 260;
         }
 
+        public override void UpdateHUD(Character character)
+        {
+            GuiFrame.Update(1.0f / 60.0f);
+        }
+
         private bool ToggleAutoTemp(GUITickBox tickBox)
         {
             unsentChanges = true;