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.

core/chat_blob.py

@@ -1,9 +1,10 @@
 class ChatBlob:
-    def __init__(self, title, msg, prefix="", suffix=""):
+    def __init__(self, title, msg, prefix="", suffix="", embed=True):
         self.title = title
         self.msg = msg.strip("\n")
         self.page_prefix = prefix
         self.page_postfix = suffix
+        self.embed = embed
 
     def __str__(self):
         return f"ChatBlob('{self.title}', '{self.msg}')"