rewrite: Initial rewrite skeleton.

Remove modules that will no longer be required.
Move pending modules to pending-rewrite folders.

bot/settings/__init__.py

@@ -1,6 +0,0 @@
-from .base import *  # noqa
-from .setting_types import *  # noqa
-
-from .user_settings import UserSettings, UserSetting  # noqa
-from .guild_settings import GuildSettings, GuildSetting  # noqa
-from .app_settings import AppSettings