Navigation between app fragments uses ShareTab as arguments. The newly used
SendTabUseCases uses TabData which is not Parcelable.
For minimal changes we'll keep both data classes and ShareController will know
how to map between the two.
Removed the `sessionId` property of ShareTab as it isn't needed anymore.
`ShareController` defines a contract with all possible `ShareFragment`'s
behavior changes and comes with a default implementation -
`DefaultShareController`.
It is to be delegated by all `ShareFragment`s contained Views' Interactors
following any user interactions.
Jeff Boek