Add inventory and pickup components with associated resources and presenters

Code/Presenters/GamePresenter.cs

@@ -10,6 +10,7 @@ using GameCore.ECS;
 using GameCore.ECS.Interfaces;
 using GameCore.Events;
 using GameCore.Input;
+using GameCore.Inventory;
 using GameCore.Movement;
 using Godot;
 
@@ -54,6 +55,8 @@ public partial class GamePresenter : Node
         _world.RegisterSystem(new JumpSystem());
         
         _world.RegisterSystem(new AttributeSystem());
+        _world.RegisterSystem(new PickupSystem());
+        _world.RegisterSystem(new InventorySystem(_world));
         
         _world.RegisterSystem(new WeaponSystem());
         _world.RegisterSystem(new ProjectileSystem());

Code/Presenters/PickupPresenter.cs

@@ -0,0 +1,43 @@
+using CryptonymThunder.Code.Autoloads;
+using GameCore.ECS;
+using GameCore.ECS.Interfaces;
+using GameCore.Physics;
+using Godot;
+
+namespace CryptonymThunder.Code.Presenters;
+
+public partial class PickupPresenter : Area3D, IEntityPresenter, IPresenterComponent
+{
+    private World _world;
+    private PresenterRegistry _presenterRegistry;
+    public Entity CoreEntity { get; set; }
+
+    public override void _Ready()
+    {
+        BodyEntered += OnBodyEnter;
+    }
+
+    private void OnBodyEnter(Node3D body)
+    {
+        if (_presenterRegistry.TryGetEntity(body.GetInstanceId(), out var hitEntity))
+        {
+            _world.AddComponent(hitEntity, new CollisionEventComponent(CoreEntity));
+        }
+    }
+
+    public void Initialize(Entity coreEntity, World world)
+    {
+        CoreEntity = coreEntity;
+        _world = world;
+        _presenterRegistry = GetNode<PresenterRegistry>("/root/PresenterRegistry");
+        BodyEntered += OnBodyEnter;
+    }
+
+    public void SyncToPresentation(float delta)
+    {
+    }
+
+    public void SyncToCore(float delta)
+    {
+    }
+}