get rid of the MessageDistributor module... & update discord, to work with API v10

Added discord commands (issue: as they're running over the event hub, they're processed on the same track as other events. => activity ingame triggers the next run; otherwise there's some delay for responses)
relay is a standard module now.

modules/core/accounting/preference_controller.py

@@ -1,3 +1,5 @@
+import typing
+
 from core.buddy_service import BuddyService
 from core.chat_blob import ChatBlob
 from core.command_alias_service import CommandAliasService
@@ -11,8 +13,9 @@ from core.text import Text
 from core.translation_service import TranslationService
 from core.igncore import IgnCore
 from core.util import Util
-from modules.core.accounting.services.account_service import AccountService
-from modules.core.discord.discord_controller import DiscordController
+if typing.TYPE_CHECKING:
+    from modules.core.accounting.services.account_service import AccountService
+    from modules.core.discord.discord_controller import DiscordController
 
 
 @instance()