core (common): added a notifications counter on ContactButton and use it in JidSelector: A notifications counter is drawned above avatar if `nofifs` key is present and not empty in `data`. This is used in JidSelector to show counter when necessary with opened chats.

[DEFAULT]
bridge = pb
log_level = debug
log_fmt = #[%%(levelname)s][%%(name)s] %%(message)s

[cagou]
no_certificate_validation = true
log_level = debug
log_fmt = [%%(levelname)s][%%(name)s] %%(message)s