Implement human pockets and ID card slot correctly.

Pockets & ID need uniform equipped. Pockets accept any sufficiently small item.

Content.Server/GameObjects/Components/GUI/IInventoryController.cs

@@ -0,0 +1,20 @@
+using Robust.Shared.Interfaces.GameObjects;
+using static Content.Shared.GameObjects.Components.Inventory.EquipmentSlotDefines;
+
+namespace Content.Server.GameObjects
+{
+    /// <summary>
+    ///     Allows for overriding inventory-related behavior on an entity.
+    /// </summary>
+    public interface IInventoryController
+    {
+        /// <summary>
+        ///     Can be implemented to override "can this item be equipped" behavior.
+        /// </summary>
+        /// <param name="slot">The slot to be equipped into.</param>
+        /// <param name="entity">The entity to equip.</param>
+        /// <param name="flagsCheck">Whether the entity passes default slot masks & flags checks.</param>
+        /// <returns>True if the entity can be equipped, false otherwise</returns>
+        bool CanEquip(Slots slot, IEntity entity, bool flagsCheck) => flagsCheck;
+    }
+}