Major collision detection improvements, more file organization, and added key interactable

Levels/Interactables/Silver Key Pickup.gd

@@ -0,0 +1,9 @@
+extends Area2D
+
+
+func _on_silver_key_pickup_body_entered(body: Node):
+    if 'player' in body.get_groups():
+        body.add_item('Silver Key')
+
+    call_deferred('queue_free')
+    return