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Add time measurement of tests and subtests to human-readable output and JUnit export

See merge request !12

Add Windows and 32-bit Linux CI

Closes #20

See merge request !11

Revert previous commit (color is still useful on Windows for CI tests and when e.g. msys is used); add --no-color flag instead

Do not run tests which due to --parallel-job contain no sub-tests (otherwise they are run with a single --run argument and may be marked as failed)

See https://docs.gitlab.com/ee/ci/yaml/README.html#parallel for details.

Fix bug where stderr would not appear and application would freeze when the stderr buffer is full and stdout is not being written to (in case of utterly broken tests)

Add toString instance for CustomFailReason

See merge request !10

Use source locations in JUnit export when available

See merge request !9