Fixed warnings caused by non-existing messagehub channels.

Changed the setting registration, removed the warnings.
Loot roll messages are more obvious now.
Superadmins are meant to stay mostily hidden, but are being exposed in !system again.

core/igncore.py

@@ -42,7 +42,7 @@ class Tyrbot:
         self.last_timer_event = 0
         self.start_time = int(time.time())
         self.major_version = "IGNCore v2.6"
-        self.minor_version = "2"
+        self.minor_version = "3"
         self.incoming_queue = FifoQueue()
         self.mass_message_queue = None
         self.conns = DictObject()