Device network as ecs (#4205)

* Work on DeviceNetworkSystem

* Implement device networking as ecs
Remove mailing unit code for now
Remove device network metadata

* Implement integration tests for device networking

* Remove manual updating DeviceNetworkSystem and use WaitRunTicks

* Fix wrong component name in ignored components

* Apply suggestions from code review

Co-authored-by: mirrorcult <notzombiedude@gmail.com>

* Rename NetworkUtils to DeviceNetworkConstants
Change connection type constants to enum
Remove create function from network payload class

* Change broken nodegroup check in wirenet to grid check

* Change ComponentManager to entity manager in DeviceNetworkSystem

* Fix smaller mistakes

* Wtf random test fail pls run them again smh

* Fix DataField in DeviceNetworkComponent

* Fix yaml in DeviceNetworkTest

* Fix DeviceNetworkComponent DeviceNetId property

Co-authored-by: Julian Giebel <j.giebel@netrocks.info>
Co-authored-by: mirrorcult <notzombiedude@gmail.com>

Content.Server/DeviceNetwork/Systems/WiredNetworkSystem.cs

@@ -0,0 +1,39 @@
+using Content.Server.DeviceNetwork.Components;
+using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.NodeGroups;
+using Content.Server.Power.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Content.Server.DeviceNetwork.Systems
+{
+    [UsedImplicitly]
+    public class WiredNetworkSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<WiredNetworkComponent, BeforePacketSentEvent>(OnBeforePacketSent);
+        }
+
+        /// <summary>
+        /// Checks if both devices are on the same grid
+        /// </summary>
+        private void OnBeforePacketSent(EntityUid uid, WiredNetworkComponent component, BeforePacketSentEvent args)
+        {
+            IEntity sender = EntityManager.GetEntity(args.Sender);
+            IEntity receiver = EntityManager.GetEntity(uid);
+
+            if (receiver.Transform.GridID != sender.Transform.GridID)
+            {
+                args.Cancel();
+            }
+        }
+
+        //Things to do in a future PR:
+        //Abstract out the connection between the apcExtensionCable and the apcPowerReceiver
+        //Traverse the power cables using path traversal
+        //Cache an optimized representation of the traversed path (Probably just cache Devices)
+    }
+}