- avoid the usage of a lot of singletons, use methods in `CoreManager` instead
  - create a `UnregisteredSipAddressesProxyModel` model
  - unstable

  - 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`
  - ...

- use vcard of Contact in qml
- remove `sipAddress` attribute of Contact
- refactoring...

  - `ContactEdit` supports emails edition
  - Add a `SmartConnect` component