- Ignore errors in `Drop` implementations.
- Replace `AlternateScreen::from` with an `IntoAlternateScreen` trait
which doesn't panic on errors, to make the API more consistent with
the `raw` module.
* Add (optional) support for alternate screen (#77)
The user can manually switch between main and alternate screen or
(preferably) use the wrapper struct for automatic screen restoration.
* Add two examples for screen switching
* Improve screen module documentation