Rtfcre

This release fixes parsing of files with non-standard spacing.

While version 1.2 included support for non-ASCII translations, I inadvertently left the steno part unescaped. This would continue to cause issues for [plover-korean](https://github.com/nsmarkop/plover_korean) and similar theories that use non-ASCII stroke labels. This release fixes that issue.


{\*\cxs ㅎㄹ}\u54624{\*\cxcomment Before -- escaped translation, unescaped steno}
{\*\cxs \u12622\u12601}\u54624{\*\cxcomment After -- escaped steno}

This version introduces these new features:

* Non-ASCII steno strokes are now supported (2).
* `\cxsystem` now uses this library's version string when converting from JSON, rather than leaving it empty.

It also includes the following bug fixes:

* Dictionaries with a non-text entry at the very end now parse correctly (1).
* Empty dictionaries and dictionaries with only one entry now parse correctly (1).
* The longest key calculation is no longer off by one; this prevented Plover from looking up translations in dictionaries where entries have only one stroke.

This version adds a command-line utility to convert between RTF/CRE and Plover JSON dictionary files. Documentation is in README.md in the repository root, and this release comes with binaries for each platform that you can download.

This is the initial release of `rtfcre`, containing only the Python library. Wheels for Linux, macOS and Windows are available on [PyPI](https://pypi.org/project/rtfcre/1.0.0/).