Change all of body system to use entities and components (#2074)

* Early commit

* Early commit 2

* merging master broke my git

* does anyone even read these

* life is fleeting

* it just works

* this time passing integration tests

* Remove hashset yaml serialization for now

* You got a license for those nullables?

* No examine, no context menu, part and mechanism parenting and visibility

* Fix wrong brain sprite state

* Removing layers was a mistake

* just tear body system a new one and see if it still breathes

* Remove redundant code

* Add that comment back

* Separate damage and body, component states, stomach rework

* Add containers for body parts

* Bring layers back pls

* Fix parts magically changing color

* Reimplement sprite layer visibility

* Fix tests

* Add leg test

* Active legs is gone

Crab rave

* Merge fixes, rename DamageState to CurrentState

* Remove IShowContextMenu and ICanExamine

Content.Server/EntryPoint.cs

@@ -1,6 +1,5 @@
 using Content.Server.AI.Utility.Considerations;
 using Content.Server.AI.WorldState;
-using Content.Server.Body.Network;
 using Content.Server.Database;
 using Content.Server.GameObjects.Components.Mobs.Speech;
 using Content.Server.GameObjects.Components.NodeContainer.NodeGroups;
@@ -49,8 +48,6 @@ namespace Content.Server
 
             IoCManager.BuildGraph();
 
-            IoCManager.Resolve<IBodyNetworkFactory>().DoAutoRegistrations();
-
             _gameTicker = IoCManager.Resolve<IGameTicker>();
 
             IoCManager.Resolve<IServerNotifyManager>().Initialize();