Runtime: work around 1s delay added when using twisted reactor's callLater.

Since wxPython4, using wxReactor from non-main thread was producing
exceptions in wxWidget's C++ code. Then reactor.run() was called from
main thread, and runtime's worker was delegating calls to reactor
with callLater(0, callable).

While this worked perfectly with wxReactor, it did introduce an unexplained
1 second delay to each worker call when using nomal linux reactors
(i.e. without wxPython). As a workaround reactor runs in a thread when using
twisted without wxPython

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image: skvorl/beremiz-requirements

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pipelines:

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  default:

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    - parallel:

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        - step:

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            name: Codestyle checks

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            script:

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              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3

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              - /usr/bin/python --version

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              - ./tests/tools/check_source.sh

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        - step:

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            name: Application tests

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            max-time: 10

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            script:

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              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3

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              - ./tests/tools/run_python_tests.sh

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