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/Interfaces/IDeviceNetwork.cs

@@ -0,0 +1,25 @@
+using System;
+using Content.Server.GameObjects.EntitySystems.DeviceNetwork;
+
+namespace Content.Server.Interfaces
+{
+    /// <summary>
+    /// Package based device network allowing devices to communicate with eachother
+    /// </summary>
+    public interface IDeviceNetwork
+    {
+        /// <summary>
+        /// Registers a device with the device network
+        /// </summary>
+        /// <param name="netId"><see cref="NetworkUtils"/>The id of the network to register with</param>
+        /// <param name="frequency">The frequency the device receives packages on. Wired networks use frequency 0</param>
+        /// <param name="messageHandler">The delegate that gets called when the device receives a message</param>
+        /// <param name="receiveAll">If the device should receive all packages on its frequency or only ones addressed to itself</param>
+        /// <returns></returns>
+        public DeviceNetworkConnection Register(int netId, int frequency, OnReceiveNetMessage messageHandler, bool receiveAll = false);
+        /// <see cref="Register(int, int, OnReceiveNetMessage, bool)"/>
+        public DeviceNetworkConnection Register(int netId, OnReceiveNetMessage messageHandler, bool receiveAll = false);
+
+        public void Update();
+    }
+}