`ScreenOverlay` marks an `Overlay` with a `Screen` defining its content. `ModalScreenOverlayDialogFactory` can show a `ScreenOverlay` as an `android.app.Dialog`, taking care of updating the content view and managing the Back button. It's the much simpler replacement for `ModalViewContainer`. Also introduces two new `ViewEnvironment` values: - `ModalArea`, which allows dialogs to restrict themselves to a subset of the screen. `ModalScreenOverlayDialogFactory` applies this automatically - `CoveredByModal`, used by `BodyAndModalsContainer` and `LayeredDialogs` to disable touch and keyboard events reliably In sample code, `PanelOverlay` replaces `PanelContainerScreen`, and the Tic Tac Toe sample is updated to use the new hotness. I think the diff of the sample code really highlights how much the new marker interfaces improve our composition story. That said, the `ScrimScreen` bit in the sample is a little rough. In the old code we magically swizzled the scrim into place automatically. This PR seems big enough already, so I'll follow up with a clean up that does something similar and deletes all the deprecated sample code. Fixes #259, #138, #99, #204, #314, #589

Deprecate AlertContainerScreen, AlertScreen, HasModals, etc. #589

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