* For #4396 - Rename BookmarkInteractor methods
Following the naming model used in other Interactors this too will use reactive
method names in the form of "on..." instead of the previous imperative model.
Kept the imperative naming model for the methods from `SelectionInteractor` as
they are a new addition and I'm not sure about the future direction.
* For #4396 - Add a BookmarkController
It abstracts the Fragment behavior in a contract through which various
Interactors can inform about the specific View changes and can ask for
modifications in their container Fragment.
This contract and it's implementation - `DefaultBookmarkController` are the
result of extracting the container Fragment's business logic from
`BookmarkFragmentInteractor` in it's own standalone component.
* For #4396 - Refactored Bookmark related tests
Added a new `BookmarkControllerTest` tests class which complements the new
`BookmarkController` to ensure that it properly operates on `BookmarkFragment`
Also refactored the existing `BookmarkFragmentInteractorTest` to accommodate
`BookmarkFragmentInteractor`'s now more specialized behavior.
setting menu title should also set content description. I added the setContentDescription programmatically in order to ensure that the content description is being set. If content description matches title it won't be read twice
With this we can remove the `whenStarted` workaround. This new API
internally creates (and uses) a scope bound to the fragment's view and
will not invoked the lambda (send state updates) when the view is
detached or the fragment's lifecylce is stopped or destroyed.
To make this match the style of the other button I applied the same style to it
and also changed it to be a MaterialButton.
I also decided to extract the margin and padding values of the button.
Emily Kager