Convert StomachBehavior to a component/system + rejig body namespaces (#5249)

* Convert StomachBehavior to a component/system + rejig body namespaces

* test

* slightly more namespace changes

* remove

* Hello?????

* fuck you github test runner

* reviews

* oobsy!

Content.Server/Body/Components/BodyComponent.cs

@@ -0,0 +1,108 @@
+using Content.Server.Ghost;
+using Content.Shared.Audio;
+using Content.Shared.Body;
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Part;
+using Content.Shared.Random.Helpers;
+using Content.Shared.Sound;
+using Robust.Shared.Audio;
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Log;
+using Robust.Shared.Player;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Body.Components
+{
+    [RegisterComponent]
+    [ComponentReference(typeof(SharedBodyComponent))]
+    [ComponentReference(typeof(IGhostOnMove))]
+    public class BodyComponent : SharedBodyComponent, IGhostOnMove
+    {
+        private Container _partContainer = default!;
+
+        [DataField("gibSound")] private SoundSpecifier _gibSound = new SoundCollectionSpecifier("gib");
+
+        protected override bool CanAddPart(string slotId, SharedBodyPartComponent part)
+        {
+            return base.CanAddPart(slotId, part) &&
+                   _partContainer.CanInsert(part.Owner);
+        }
+
+        protected override void OnAddPart(BodyPartSlot slot, SharedBodyPartComponent part)
+        {
+            base.OnAddPart(slot, part);
+
+            _partContainer.Insert(part.Owner);
+        }
+
+        protected override void OnRemovePart(BodyPartSlot slot, SharedBodyPartComponent part)
+        {
+            base.OnRemovePart(slot, part);
+
+            _partContainer.ForceRemove(part.Owner);
+            part.Owner.RandomOffset(0.25f);
+        }
+
+        protected override void Initialize()
+        {
+            base.Initialize();
+
+            _partContainer = Owner.EnsureContainer<Container>($"{Name}-{nameof(BodyComponent)}");
+            var preset = Preset;
+
+            if (preset != null)
+            {
+                foreach (var slot in Slots)
+                {
+                    // Using MapPosition instead of Coordinates here prevents
+                    // a crash within the character preview menu in the lobby
+                    var entity = Owner.EntityManager.SpawnEntity(preset.PartIDs[slot.Id], Owner.Transform.MapPosition);
+
+                    if (!entity.TryGetComponent(out SharedBodyPartComponent? part))
+                    {
+                        Logger.Error($"Entity {slot.Id} does not have a {nameof(SharedBodyPartComponent)} component.");
+                        continue;
+                    }
+
+                    SetPart(slot.Id, part);
+                }
+            }
+        }
+
+        protected override void Startup()
+        {
+            base.Startup();
+
+            // This is ran in Startup as entities spawned in Initialize
+            // are not synced to the client since they are assumed to be
+            // identical on it
+            foreach (var (part, _) in Parts)
+            {
+                part.Dirty();
+            }
+        }
+
+        public override void Gib(bool gibParts = false)
+        {
+            base.Gib(gibParts);
+
+            SoundSystem.Play(Filter.Pvs(Owner), _gibSound.GetSound(), Owner.Transform.Coordinates, AudioHelpers.WithVariation(0.025f));
+
+            if (Owner.TryGetComponent(out ContainerManagerComponent? container))
+            {
+                foreach (var cont in container.GetAllContainers())
+                {
+                    foreach (var ent in cont.ContainedEntities)
+                    {
+                        cont.ForceRemove(ent);
+                        ent.Transform.Coordinates = Owner.Transform.Coordinates;
+                        ent.RandomOffset(0.25f);
+                    }
+                }
+            }
+
+            Owner.QueueDelete();
+        }
+    }
+}