* For #2754 Add tab cards to share sheet
* For #2754: Fix background near rounded corners and ShareButtonAppearanceTest
* Add license to share_tab_item
In an effort to respect the initial MVI architecture I've broken the
complex `AppShareView` in 3 separate Views
- `ShareCloseView`
- `ShareToAccountDevicesView`
- `ShareToAppsView`
They are standalone Views (extending LayoutContainer) which know nothing about
each other or their parent and so offer their container the possibility to
order or display them in any form later.
According to the lib-state contract they are only responsible to
- inflate themselves in their injected containerView
- render a certain state (to be added in later commits)
- delegate all user interaction to an associated Interactor
As per #4341.
Also reformatted layouts to have a more consistent style.
Also refactored `AppShareRecyclerView` and `AccountDevicesShareRecyclerView` by
defining their LayoutManager in XML to reduce code complexity.
Colin Lee