core, quick_frontend, primitivus, wix: Contacts List refactoring phase 1:

- QuickContactManagement is not used anymore and will be removed, ContactList + Core are used instead
	- disconnected contacts are now displayed in Primitivus (M-d to show/hide them)
	- avatars are temporary unavailable in wix
	- new bridge method: getContactsFromGroup

frontends/src/quick_frontend/quick_chat.py

@@ -99,7 +99,7 @@ class QuickChat():
 
     def _get_nick(self, jid):
         """Return nick of this jid when possible"""
-        return jid.resource if self.type == "group" else (self.host.CM.getAttr(jid,'nick') or self.host.CM.getAttr(jid,'name') or jid.node)
+        return jid.resource if self.type == "group" else (self.host.contact_list.getCache(jid,'nick') or self.host.contact_list.getCache(jid,'name') or jid.node)
     
     def printMessage(self, from_jid, msg, profile, timestamp):
         """Print message in chat window. Must be implemented by child class"""