Prompt-toolkit

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New features:
- Expose a `get_ptpython` function in the global namespace, to get programmatic
access to the REPL.
- Expose `embed()` at the top level of the package. Make it possible to do
`from ptpython import embed`.

Fixes:
- Properly handle exceptions when trying to access `__pt_repr__`.
- Properly handle `SystemExit`.

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New features:
- Add support for top-level await.
- Refactoring of event loop usage:

* The ptpython input UI will now run in a separate thread. This makes it
possible to properly embed ptpython in an asyncio application, without
having to deal with nested event loops (which asyncio does not support).

* The "eval" part doesn't anymore take place within a ptpython coroutine, so
it can spawn its own loop if needed. This also fixes `asyncio.run()` usage
in the REPL, which was broken before.

- Added syntax highlighting and autocompletion for !-style system commands.

Fixes:
- Remove unexpected additional line after output.
- Fix system prompt. Accept !-style inputs again.
- Don't execute PYTHONSTARTUP when -i flag was given.

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Fixes:
- Do dictionary completion on Sequence and Mapping objects (from
collections.abc). Note that dictionary completion is still turned off by
default.

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New features:
- Allow replacing `PythonInput.completer` at runtime (useful for tools build on
top of ptpython).
- Show REPL title in pager.

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New features:
- Optional output formatting using Black.
- Optional pager for displaying outputs that don't fit on the screen.
- Added --light-bg and --dark-bg flags to automatically optimize the brightness
of the colors according to the terminal background.
- Add `PTPYTHON_CONFIG_HOME` for explicitly setting the config directory.
- Show completion suffixes (like '(' for functions).

Fixes:
- Fix dictionary completion on Pandas objects.
- Stop using deprecated Jedi functions.

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New features:
- Option to show/hide private attributes during a completion
- Added `insert_blank_line_after_input` option similar to
`insert_blank_line_after_output`.

Fixes:
- Fixed some formatting issues of `__pt_repr__`.
- Abbreviate completion meta information for dictionary completer if needed.