Fix humanoid appearances for placement manager (#18291)

Content.Shared/Clothing/Components/LoadoutComponent.cs

@@ -0,0 +1,16 @@
+using Content.Shared.Roles;
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.List;
+
+namespace Content.Shared.Clothing.Components;
+
+[RegisterComponent, NetworkedComponent]
+public sealed class LoadoutComponent : Component
+{
+    /// <summary>
+    /// A list of starting gears, of which one will be given.
+    /// All elements are weighted the same in the list.
+    /// </summary>
+    [DataField("prototypes", required: true, customTypeSerializer: typeof(PrototypeIdListSerializer<StartingGearPrototype>)), AutoNetworkedField]
+    public List<string>? Prototypes;
+}

Content.Shared/Clothing/LoadoutSystem.cs

@@ -0,0 +1,35 @@
+using Content.Shared.Clothing.Components;
+using Content.Shared.Roles;
+using Content.Shared.Station;
+using Robust.Shared.Prototypes;
+using Robust.Shared.Random;
+
+namespace Content.Shared.Clothing;
+
+/// <summary>
+/// Assigns a loadout to an entity based on the startingGear prototype
+/// </summary>
+public sealed class LoadoutSystem : EntitySystem
+{
+    // Shared so we can predict it for placement manager.
+
+    [Dependency] private readonly SharedStationSpawningSystem _station = default!;
+    [Dependency] private readonly IPrototypeManager _protoMan = default!;
+    [Dependency] private readonly IRobustRandom _random = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<LoadoutComponent, MapInitEvent>(OnMapInit);
+    }
+
+    private void OnMapInit(EntityUid uid, LoadoutComponent component, MapInitEvent args)
+    {
+        if (component.Prototypes == null)
+            return;
+
+        var proto = _protoMan.Index<StartingGearPrototype>(_random.Pick(component.Prototypes));
+        _station.EquipStartingGear(uid, proto, null);
+    }
+}