base::lambda -> Fn (type alias for std::function).
base::lambda_once -> FnMut (type alias for base::unique_function).
base::lambda_guarded -> crl::guard.
base::lambda_call_type_t -> crl::deduced_call_type.
Also allow server-side search inside restricted users list.
Also allow server-side search inside kicked users list.
Also allow PeerListController to work not only in PeerListBox.
Now group of Ui::Radiobutton instances share Ui::RadiobuttonGroup.
All value management is done through the group instance, not through
separate radio buttons. Also a template for groups over enums added.