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/primitivus/constants.py

@@ -54,6 +54,7 @@ __builtin__.__dict__['const_PALETTE']  = [
     ('warning', 'light red', 'default'),
     ('progress_normal', 'default', 'black'),
     ('progress_complete', 'default', 'light red'),
+    ('show_disconnected', 'dark gray', 'default'),
     ('show_normal', 'default', 'default'),
     ('show_normal_focus', 'default, bold', 'default'),
     ('show_chat', 'dark green', 'default'),
@@ -67,7 +68,8 @@ __builtin__.__dict__['const_PALETTE']  = [
     ('status', 'yellow', 'default'),
     ('status_focus', 'yellow, bold', 'default'),
     ]
-__builtin__.__dict__['const_SHOW_ICON'] = {"": (u'✔', "show_normal"),
+__builtin__.__dict__['const_SHOW_ICON'] = {"unavailable": (u'⨯', "show_disconnected"), 
+                                          "": (u'✔', "show_normal"),
                                           "chat": (u'✆', "show_chat"),
                                           "away": (u'✈', "show_away"),
                                           "dnd": (u'✖', "show_dnd"),