ECS and cleanup body system, merge body templates and presets into body prototypes (#11991)

Co-authored-by: Jezithyr <Jezithyr@gmail.com>

Content.Shared/Body/Organ/OrganComponent.cs

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+using Content.Shared.Body.Systems;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Body.Organ;
+
+[RegisterComponent, NetworkedComponent]
+[Access(typeof(SharedBodySystem))]
+public sealed class OrganComponent : Component
+{
+    [ViewVariables]
+    [DataField("body")]
+    public EntityUid? Body;
+
+    [ViewVariables]
+    [DataField("parent")]
+    public OrganSlot? ParentSlot;
+}

Content.Shared/Body/Organ/OrganComponentState.cs

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+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Body.Organ;
+
+[Serializable, NetSerializable]
+public sealed class OrganComponentState : ComponentState
+{
+    public readonly EntityUid? Body;
+    public readonly OrganSlot? Parent;
+
+    public OrganComponentState(EntityUid? body, OrganSlot? parent)
+    {
+        Body = body;
+        Parent = parent;
+    }
+}

Content.Shared/Body/Organ/OrganSlot.cs

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+using Content.Shared.Body.Systems;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Body.Organ;
+
+[Serializable, NetSerializable]
+[Access(typeof(SharedBodySystem))]
+[DataRecord]
+public sealed record OrganSlot(string Id, EntityUid Parent)
+{
+    public EntityUid? Child { get; set; }
+
+    // Rider doesn't suggest explicit properties during deconstruction without this
+    public void Deconstruct(out EntityUid? child, out string id, out EntityUid parent)
+    {
+        child = Child;
+        id = Id;
+        parent = Parent;
+    }
+}