Refactor conversation stuff

overworld/entity/Entity.gd

@@ -11,6 +11,7 @@ enum MovementType {
 enum InteractType {
   NONE,
   CONVERSATION,
+  ONE_TIME_ITEM,
   TEST_BATTLE
 };
 
@@ -27,7 +28,10 @@ var button := func():
 # Interaction settings
 @export_category("Interactions")
 @export var interactType:InteractType = InteractType.NONE
-@export var conversation:Array[ConversationElement] = []
+@export var conversation:Array[ConversationResource] = []
+
+@export_category("One-Time Item")
+@export var oneTimeItem:ItemResource = null
 
 # TEST BATTLE
 @export_category("Test Battle")