feature(parse): scxml import

[sverweij]

Description

• adds an scxml parser to state-machine-cat
• available on the command line (--input-type scxml or -I scxml) (on npmjs in the beta channel; npm i state-machine-cat@beta
• available on state-machine-cat.js.org as a menu item (for the duration of the PR on https://sverweij.gitlab.io/state-machine-cat)

Motivation and Context

• improves interoperability - state-machine-cat can serve as a visualisation engine for tools/ program/s frameworks that can emit scxml (like xstate or commons scxml) - as per suggestion in export to xstate format #59.

TODO

• handle transitions without a target (possible within SCXML, but not in state-machine-cat)
• more precise tests against the corpus
• refactor for cleanliness & readability (code climate started to complain as well already :-) )
• design rationale (e.g. in docs/SCXML.md)
• end user documentation

How Has This Been Tested?

• additional automated unit/ integration tests
• automated non-regression tests

Screenshots

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• The code I add will be subject to The MIT license, and I'm OK with that.
• The code I've added is my own original work.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codeclimate]

The PR diff size of 5270 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

Code Climate has analyzed commit de2fb88 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (100% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

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