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

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

Content.Shared/Body/Part/BodyPartComponent.cs

@@ -0,0 +1,44 @@
+using Content.Shared.Body.Components;
+using Content.Shared.Body.Organ;
+using Content.Shared.Body.Systems;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Body.Part;
+
+[RegisterComponent, NetworkedComponent]
+[Access(typeof(SharedBodySystem))]
+public sealed class BodyPartComponent : Component
+{
+    [ViewVariables]
+    [DataField("body")]
+    public EntityUid? Body;
+
+    [ViewVariables]
+    [DataField("parent")]
+    public BodyPartSlot? ParentSlot;
+
+    [ViewVariables]
+    [DataField("children")]
+    public Dictionary<string, BodyPartSlot> Children = new();
+
+    [ViewVariables]
+    [DataField("organs")]
+    public Dictionary<string, OrganSlot> Organs = new();
+
+    [ViewVariables]
+    [DataField("partType")]
+    public BodyPartType PartType = BodyPartType.Other;
+
+    // TODO BODY Replace with a simulation of organs
+    /// <summary>
+    ///     Whether or not the owning <see cref="Body"/> will die if all
+    ///     <see cref="BodyComponent"/>s of this type are removed from it.
+    /// </summary>
+    [ViewVariables]
+    [DataField("vital")]
+    public bool IsVital;
+
+    [ViewVariables]
+    [DataField("symmetry")]
+    public BodyPartSymmetry Symmetry = BodyPartSymmetry.None;
+}