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.Client/GameObjects/Components/Body/BodyComponent.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using Content.Client.GameObjects.Components.Disposal;
 using Content.Client.GameObjects.Components.MedicalScanner;
 using Content.Shared.GameObjects.Components.Body;
@@ -14,7 +14,8 @@ namespace Content.Client.GameObjects.Components.Body
         public bool CanDrop(CanDropEventArgs eventArgs)
         {
             if (eventArgs.Target.HasComponent<DisposalUnitComponent>() ||
-                eventArgs.Target.HasComponent<MedicalScannerComponent>())
+                eventArgs.Target.HasComponent<MedicalScannerComponent>() ||
+                eventArgs.Target.HasComponent<DisposalMailingUnitComponent>())
             {
                 return true;
             }