Pipe visualizers (#3042)

* modifies pipe sprites to look not connected

* pipe connector sprites

* PipeConnectorVisualizer

* Remove pipe visualizer

* Revert "Remove pipe visualizer"

This reverts commit dc8da93f99f20aa55247c6a94d26c7a75a3d1782.

* PipeDirection can be set with the sprite updating correctly

* fixes meta files

* removes unused vent/scrubber directions

* OnConnectedDirectionsNeedsUpdating

* comments + OnConnectedDirectionsNeedsUpdating gets called

* fix connecteddirections bug

* Combines ConnectedDirections sent to visualizer

* fixes unconnected pipe sprites

* Adds PipeConnectorVisualizer to other piping entities

* code cleanup

* Fixed bug with ConnectedDirections not being set correctly

* diff fix

* rotation simplification

* Improves rsi serialization

* enable nullable

* wip

* visualizer cleanup

* nullable cleanup

Co-authored-by: py01 <pyronetics01@gmail.com>

Content.Shared/GameObjects/Components/Atmos/SharedPipeComponent.cs

@@ -13,15 +13,19 @@ namespace Content.Shared.GameObjects.Components.Atmos
     [Serializable, NetSerializable]
     public class PipeVisualState
     {
-        public readonly PipeDirection PipeDirection;
+        public readonly PipeShape PipeShape;
 
-        public PipeVisualState(PipeDirection pipeDirection)
+        public readonly PipeDirection ConnectedDirections;
+
+        public PipeVisualState(PipeShape pipeShape, PipeDirection connectedDirections)
         {
-            PipeDirection = pipeDirection;
+            PipeShape = pipeShape;
+            ConnectedDirections = connectedDirections;
         }
     }
 
     [Flags]
+    [Serializable, NetSerializable]
     public enum PipeDirection
     {
         None = 0,
@@ -63,6 +67,25 @@ namespace Content.Shared.GameObjects.Components.Atmos
         Fourway
     }
 
+    public static class PipeShapeHelpers
+    {
+        /// <summary>
+        ///     Gets the direction of a shape when facing 0 degrees (the initial direction of entities).
+        /// </summary>
+        public static PipeDirection ToBaseDirection(this PipeShape shape)
+        {
+            return shape switch
+            {
+                PipeShape.Half => PipeDirection.East,
+                PipeShape.Straight => PipeDirection.Lateral,
+                PipeShape.Bend => PipeDirection.SEBend,
+                PipeShape.TJunction => PipeDirection.TEast,
+                PipeShape.Fourway => PipeDirection.Fourway,
+                _ => throw new ArgumentOutOfRangeException(nameof(shape), $"{shape} does not have an associated {nameof(PipeDirection)}."),
+            };
+        }
+    }
+
     public static class PipeDirectionHelpers
     {
         public const int PipeDirections = 4;