Robotframework-webpack

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Bugfixes:

- Fix typo in 'Stop Webpack' keyword which breaks the entire library when it is imported.
[timo]

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Bugfixes:

- Raise RuntimeError when 'Start Webpack' and 'Stop Webpack' fail.
[timo]

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Bugfixes:

- Remove br in README which breaks the pypi page.
[timo]

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Bugfixes:

- Fix ReST in README.
[timo]

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Breaking Changes:

- Refactor 'Start Webpack' keyword.
Remove "host", "port", "content_base", "config", "webpack_bin_path", "debug" params.
Keep "path" param. Add required "command" param and an optional "check" param.
[timo]

Bugfixes:

- Use a process group to start Webpack to being able to stop all child processes.
This fixes issues with leftover child processes with create-react-app.
[timo]

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Breaking Changes:

- Change ROBOT_LIBRARY_SCOPE to 'GLOBAL'. It does not make sense to fire up
webpack for every single test.
[timo]