- remove useless smart-search-bar from cpp
  - create a new `SipAddressesModel` component
  - create a `UnregisteredSipAddressesModel` (it uses the previous model)
  - `TimelineModel` uses too this model
  - many fixes and refactoring
  - `mapToSipAddress` moved from `ContactsListModel` to `SipAddressesModel`
  - ...