[Enhance][Bug fix] Improve setting file & ...

- Fix a small bug that `best30` of API cannot have scores whose songs are not in database
- At present the setting file can be a module or a file with some of options
- Limiter can have multiple rules together now

latest version/server/user.py

@@ -1,11 +1,11 @@
 from core.character import UserCharacter
+from core.config_manager import Config
 from core.error import ArcError, NoAccess
 from core.item import ItemCore
 from core.save import SaveData
 from core.sql import Connect
 from core.user import User, UserLogin, UserOnline, UserRegister
 from flask import Blueprint, request
-from setting import Config
 
 from .auth import auth_required
 from .func import arc_try, success_return