[feat] Add support for retrieving properties of variable type Resource

with format variable["property"]

addons/ez_dialogue/dialogue_reader.gd

@@ -86,7 +86,6 @@ func next(choice_index: int = 0):
 	if is_running:
 		return
 
-	dialogue_visit_history = []
 	if choice_index >= 0 && choice_index < _pending_choice_actions.size():
 		# select a choice
 		var commands = _pending_choice_actions[choice_index] as Array[DialogueCommand]
@@ -271,6 +270,13 @@ func _retrieve_nested_values(searchKeys: Array):
 						printerr("Error in [%s]: Can't find key '%s' from the stack '%s'"\
 							%[_get_current_node_name(), searchKeys[key],searchKeys[0]])
 						return false
+				elif currentKey is Resource:
+					if (currentKey as Resource).get(searchKeys[key]):
+						currentKey = (currentKey as Resource).get(searchKeys[key])
+					else:
+						printerr("Error in [%s]: Can't find key '%s' from the stack '%s'"\
+							%[_get_current_node_name(), searchKeys[key],searchKeys[0]])
+						return false
 				else:	# fail safe since we only care for nested dictionaries. 
 					break
 		return currentKey