feat(core): IBehavior.IsActive

Engine.Physics2D/PhysicsEngine2D.cs

@@ -54,10 +54,16 @@ public class PhysicsEngine2D : IPhysicsEngine2D
             for (int x = 0; x < colliders.Count; x++)
             {
                 ICollider2D? colliderX = colliders[x];
+                if (!colliderX.IsActive)
+                    return;
+
                 for (int y = x + 1; y < colliders.Count; y++)
                 {
                     ICollider2D? colliderY = colliders[y];
 
+                    if (!colliderY.IsActive)
+                        return;
+
                     if (colliderX.RigidBody2D == colliderY.RigidBody2D)
                         continue;