Prompt-toolkit

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Fixes:
- Use `DummyOutput` when `sys.stdout` is `None` and `DummyInput` when
`sys.stdin` is `None`. This fixes an issue when the code runs on windows,
using pythonw.exe and still tries to interact with the terminal.
- Correctly reset `Application._is_running` flag in case of exceptions in some
situations.
- Handle SIGINT (when sent from another process) and allow binding it to a key
binding. For prompt sessions, the behavior is now identical to pressing
control-c.
- Increase the event loop `slow_duration_callback` by default to 0.5. This
prevents printing warnings if rendering takes too long on slow systems.

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Fixes:
- Prevent window content overflowing when using scrollbars.
- Handle `PermissionError` when trying to attach /dev/null in vt100 input.

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Fixes:
- Fix multiline bracketed paste on Windows

New features:
- Add support for some CSI 27 modified variants of "Enter" for xterm in the
vt100 input parser.

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Fixes:
- Fix stopping of telnet server (capture cancellation exception).

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New features:
- Improved mouse support:
* Support for click-drag, which is useful for selecting text.
* Detect mouse movements when no button is pressed.
- Support for Python 3.10.

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New features:
- Add support for strikethrough text attributes.
- Set up custom breakpointhook while an application is running (if no other
breakpointhook was installed). This enhances the usage of PDB for debugging
applications.
- Strict type checking is now enabled.

Fixes:
- Ensure that `print_formatted_text` is always printed above the running
application, like `patch_stdout`. (Before, `patch_stdout` was even completely
ignored in case of `print_formatted_text, so there was no proper way to use
it in a running application.)
- Fix handling of non-bmp unicode input on Windows.
- Set minimum Python version to 3.6.2 (Some 3.6.2 features were used).