Ptpython

Fixes:
- Consider input multiline when there's a colon at the end of the line.
- Handle bug in Jedi.
- Enable search bindings in history browser.

New features:
- Mouse support
- Fish style auto suggestion.
- Optionally disabling of line wraps.
- Use Python3Lexer for Python 3.

Fixes:
- Correctly accept file parameter in the print function of
asyncssh_repl.ReplSSHServerSession.
- Create config directory if it doesn't exist yet (For IPython entry point.)

New features:
- Implementation of history-selection: a tool to select lines from the history.
- Make exit message configurable.
- Improve start-up time: Lazy load completer grammar and lazy-import Jedi.
- Make multi-column the default completion visualisation.
- Implementation of a custom prompts. In_tokens and out_tokens can be
customized.
- Made an option to show/hide highlighting for matching parenthesis.
- Some styling improvements.

Fixes:
- Correctly add current directory to sys.path.
- Only show search highlighting when the search is the current input buffer.
- Styling fix.