Prompt-toolkit

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Bug fixes:
- Fix `currentThread()` deprecation warning.
- Fix memory leak in filters.
- Make VERSION tuple numeric.

New features:
- Add `.run()` method in `TelnetServer`. (To be used instead of
`.start()/.stop()`.

Breaking changes:
- Subclasses of `Filter` have to call `super()` in their `__init__`.
- Drop support for Python 3.6:
* This includes code cleanup for Python 3.6 compatibility.
* Use `get_running_loop()` instead of `get_event_loop()`.
* Use `asyncio.run()` instead of `asyncio.run_until_complete()`.

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Fixes:
- Another Python 3.6 fix for a bug that was introduced in 3.0.34.

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Fixes:
- Fix bug introduced in 3.0.34 for Python 3.6. Use asynccontextmanager
implementation from prompt_toolkit itself.

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Fixes:
- Improve completion performance in various places.
- Improve renderer performance.
- Handle `KeyboardInterrupt` when the stacktrace of an unhandled error is
displayed.
- Use correct event loop in `Application.create_background_task()`.
- Fix `show_cursor` attribute in `ScrollablePane`.

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Fixes:
- Improve termination of `Application`. Don't suppress `CancelledError`. This
fixes a race condition when an `Application` gets cancelled while we're
waiting for the background tasks to complete.
- Fixed typehint for `OneStyleAndTextTuple`.
- Small bugfix in `CombinedRegistry`. Fixed missing `property`.

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Bug fixes:
- Use `DummyInput` by default in `create_input()` if `sys.stdin` does not have
a valid file descriptor. This fixes errors when `sys.stdin` is patched in
certain situations.
- Fix control-c key binding for `ProgressBar` when the progress bar was not
created from the main thread. The current code would try to kill the main
thread when control-c was pressed.

New features:
- Accept a `cancel_callback` in `ProgressBar` to specify the cancellation
behavior for when `control-c` is pressed.
- Small performance improvement in the renderer.