Refactoring body system to use containers and general body cleanup (#20202)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/Body/Components/BodyComponent.cs

@@ -1,9 +1,10 @@
-using Content.Shared.Body.Part;
 using Content.Shared.Body.Prototypes;
 using Content.Shared.Body.Systems;
 using Robust.Shared.Audio;
+using Robust.Shared.Containers;
 using Robust.Shared.GameStates;
-using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
 
 namespace Content.Shared.Body.Components;
 
@@ -11,19 +12,52 @@ namespace Content.Shared.Body.Components;
 [Access(typeof(SharedBodySystem))]
 public sealed partial class BodyComponent : Component
 {
-    [DataField("prototype", customTypeSerializer: typeof(PrototypeIdSerializer<BodyPrototype>))]
-    public string? Prototype;
+    /// <summary>
+    /// Relevant template to spawn for this body.
+    /// </summary>
+    [DataField]
+    public ProtoId<BodyPrototype>? Prototype;
 
-    [DataField("root")]
-    public BodyPartSlot? Root;
+    /// <summary>
+    /// Container that holds the root body part.
+    /// </summary>
+    /// <remarks>
+    /// Typically is the torso.
+    /// </remarks>
+    [ViewVariables] public ContainerSlot RootContainer = default!;
 
-    [DataField("gibSound")]
-    public SoundSpecifier GibSound = new SoundCollectionSpecifier("gib");
+    [ViewVariables]
+    public string RootPartSlot => RootContainer.ID;
+
+    [DataField] public SoundSpecifier GibSound = new SoundCollectionSpecifier("gib");
 
     /// <summary>
     /// The amount of legs required to move at full speed.
     /// If 0, then legs do not impact speed.
     /// </summary>
-    [DataField("requiredLegs")]
-    public int RequiredLegs;
+    [DataField] public int RequiredLegs;
+
+    [ViewVariables]
+    [DataField]
+    public HashSet<EntityUid> LegEntities = new();
+}
+
+[Serializable, NetSerializable]
+public sealed class BodyComponentState : ComponentState
+{
+    public string? Prototype;
+    public string? RootPartSlot;
+    public SoundSpecifier GibSound;
+    public int RequiredLegs;
+    public HashSet<NetEntity> LegNetEntities;
+
+    public BodyComponentState(string? prototype, string? rootPartSlot, SoundSpecifier gibSound,
+        int requiredLegs, HashSet<NetEntity> legNetEntities)
+    {
+        Prototype = prototype;
+        RootPartSlot = rootPartSlot;
+        GibSound = gibSound;
+        RequiredLegs = requiredLegs;
+        LegNetEntities = legNetEntities;
+    }
 }