Pipe prototypes (#2124)

* Pipe prototypes

* PipeDirection setter

* IRotatableNode

* NodeContainer passes rotation events to its nodes

* Removes duplicate pipe prototypes that are rotations of each other

* PipeDirectionHelpers

* PipeNode rotation

* icon removal

* Pipe icons

* Icon fix

* Fixes pipe sprites and icons

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

Content.Server/GameObjects/Components/NodeContainer/Nodes/IRotatableNode.cs

@@ -0,0 +1,16 @@
+using Robust.Shared.GameObjects.Components.Transform;
+
+namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
+{
+    /// <summary>
+    ///     A <see cref="Node"/> that implements this will have its <see cref="RotateEvent(RotateEvent)"/> called when its
+    ///     <see cref="NodeContainerComponent"/> is rotated.
+    /// </summary>
+    public interface IRotatableNode
+    {
+        /// <summary>
+        ///     Rotates this <see cref="Node"/>.
+        /// </summary>
+        void RotateEvent(RotateEvent ev);
+    }
+}