core (common, share_widget): new JidSelector widget: - A widget to select jid among a list is commonly needed, so it has been implemented in core.common, based on the code from ShareWidget - ShareWidget has been adapted accordingly - new ContactButton class in core.common

[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