core, frontends: refactoring to base Libervia on QuickFrontend (big mixed commit):

/!\ not finished, everything is still instable !
    - bridge: DBus bridge has been modified to allow blocking call to be called in the same way as asynchronous calls
    - bridge: calls with a callback and no errback are now possible, default errback log the error
    - constants: removed hack to manage presence without OrderedDict, as an OrderedDict like class has been implemented in Libervia
    - core: getLastResource has been removed and replaced by getMainResource (there is a global better management of resources)
    - various style improvments: use of constants when possible, fixed variable overlaps, import of module instead of direct class import
    - frontends: printInfo and printMessage methods in (Quick)Chat are more generic (use of extra instead of timestamp)
    - frontends: bridge creation and option parsing (command line arguments) are now specified by the frontend in QuickApp __init__
    - frontends: ProfileManager manage a more complete plug sequence (some stuff formerly manage in contact_list have moved to ProfileManager)
    - quick_frontend (quick_widgets): QuickWidgetsManager is now iterable (all widgets are then returned), or can return an iterator on a specific class (return all widgets of this class) with getWidgets
    - frontends: tools.jid can now be used in Pyjamas, with some care
    - frontends (XMLUI): profile is now managed
    - core (memory): big improvment on entities cache management (and specially resource management)
    - core (params/exceptions): added PermissionError
    - various fixes and improvments, check diff for more details

src/plugins/plugin_xep_0054.py

@@ -85,6 +85,7 @@ class XEP_0054(object):
         host.bridge.addMethod("getAvatarFile", ".plugin", in_sign='s', out_sign='s', method=self.getAvatarFile)
         host.bridge.addMethod("setAvatar", ".plugin", in_sign='ss', out_sign='', method=self.setAvatar, async=True)
         host.trigger.add("presence_available", self.presenceTrigger)
+        host.memory.setSignalOnUpdate("avatar")
 
     def getHandler(self, profile):
         return XEP_0054_handler(self)