Disposal mailing (#2194)

* Implement device networking

* Implement device configuration menu

* Fix device network

* Implement disposal mailing unit

* Implement base network connection
Implement wired and wireless network connection
Implement device network metadata

* Fix dereference null error

* Fix wired network null checks

* Change BaseNetworks enum to NetworkUtils class
Add PingResponse function to NetworkUtils
Change device network file structure

* Add doc comments

* Apply suggestions from code review

Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

* Add tag validation to disposal mailing unit

* Add tag validation to the mailing unit component

* Address reviews
Change WiredNetwork can connect check
Change device networking string literals to constants

* Address reviews
Revert changes to PowerProvider and PowerReceiver
Add new NodeGroup
WELP

* Fix recursive access to Owner property

* Integrate suggested changes

* Fix TryGetWireNet acting on NullPowerProvider
Fix network connections not checking if their owner has been deleted

* Close device network connection when the owning entity got deleted
Fix mailing unit not closing the device network connection on remove

* Remove GetWireNet from NullPowerProvider

Co-authored-by: Julian Giebel <j.giebel@netrocks.info>
Co-authored-by: DrSmugleaf <DrSmugleaf@users.noreply.github.com>

Content.Server/GameObjects/EntitySystems/DeviceNetworkSystem.cs

@@ -0,0 +1,28 @@
+using Content.Server.Interfaces;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.IoC;
+
+namespace Content.Server.GameObjects.EntitySystems.DeviceNetwork
+{
+    public class DeviceNetworkSystem : EntitySystem
+    {
+        private IDeviceNetwork _network;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            _network = IoCManager.Resolve<IDeviceNetwork>();
+        }
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            if (_network == null)
+                return;
+            //(ノ°Д°）ノ︵ ┻━┻
+            _network.Update();
+        }
+    }
+}