Cmd2

* Bug Fixes
* Ctrl-C now stops a running text script instead of just the current `run_script` command
* Enhancements
* `do_shell()` now saves the return code of the command it runs in `self.last_result` for use in pyscripts

* Bug Fixes
* Fixed issue where postcmd hooks were running after an `argparse` exception in a command.

* Enhancements
* The documentation at [cmd2.rftd.io](https://cmd2.readthedocs.io) received a major overhaul
* Other
* Moved [categorize](https://cmd2.readthedocs.io/en/latest/api/utils.html#miscellaneous) utility function from **decorators** module to **utils** module
* Notes
* Now that the 1.0 release is out, `cmd2` intends to follow [Semantic Versioning](https://semver.org)

* Bug Fixes
* Corrected issue where the actual new value was not always being printed in do_set. This occurred in cases where
the typed value differed from what the setter had converted it to.
* Fixed bug where ANSI style sequences were not correctly handled in `utils.truncate_line()`.
* Fixed bug where pyscripts could edit `cmd2.Cmd.py_locals` dictionary.
* Fixed bug where cmd2 set `sys.path[0]` for a pyscript to cmd2's working directory instead of the
script file's directory.
* Fixed bug where `sys.path` was not being restored after a pyscript ran.
* Enhancements
* Renamed set command's `-l/--long` flag to `-v/--verbose` for consistency with help and history commands.
* Setting the following pyscript variables:
* `__name__`: __main__
* `__file__`: script path (as typed, ~ will be expanded)
* Only tab complete after redirection tokens if redirection is allowed
* Made `CompletionError` exception available to non-argparse tab completion
* Added `apply_style` to `CompletionError` initializer. It defaults to True, but can be set to False if
you don't want the error text to have `ansi.style_error()` applied to it when printed.
* Other
* Removed undocumented `py run` command since it was replaced by `run_pyscript` a while ago
* Renamed `AutoCompleter` to `ArgparseCompleter` for clarity
* Custom `EmptyStatement` exception is no longer part of the documented public API
* Notes
* This is a beta release leading up to the 1.0.0 release
* We intend no more breaking changes prior to 1.0.0
* Just bug fixes, documentation updates, and enhancements

* Enhancements
* Changed the default help text to make `help -v` more discoverable
* **set** command now supports tab completion of values
* Added `add_settable()` and `remove_settable()` convenience methods to update `self.settable` dictionary
* Added convenience `ansi.fg` and `ansi.bg` enums of foreground and background colors
* `ansi.style()` `fg` argument can now either be of type `str` or `ansi.fg`
* `ansi.style()` `bg` argument can now either be of type `str` or `ansi.bg`
* This supports IDE auto-completion of color names
* The enums also support
* `f-strings` and `format()` calls (e.g. `"{}hello{}".format(fg.blue, fg.reset)`)
* string concatenation (e.g. `fg.blue + "hello" + fg.reset`)
* Breaking changes
* Renamed `locals_in_py` attribute of `cmd2.Cmd` to `self_in_py`
* The following public attributes of `cmd2.Cmd` are no longer settable at runtime by default:
* `continuation_prompt`
* `self_in_py`
* `prompt`
* `self.settable` changed to `self.settables`
* It is now a Dict[str, Settable] instead of Dict[str, str]
* setting onchange callbacks have a new method signature and must be added to the
Settable instance in order to be called
* Removed `cast()` utility function
* Removed `ansi.FG_COLORS` and `ansi.BG_COLORS` dictionaries
* Replaced with `ansi.fg` and `ansi.bg` enums providing similar but improved functionality
* Notes
* This is an alpha release leading up to the 1.0.0 release
* We intend no more breaking changes prior to 1.0.0
* Just bug fixes, documentation updates, and enhancements

* Enhancements
* Reduced what gets put in package downloadable from PyPI (removed irrelevant CI config files and such)