Chaostoolkit-lib

Added

- A new `running` callback in the handler registry as the `started` callback
happens too soon in the control lifecycle.

Added

- A new `CHAOSTOOLKIT_LOADER_AUTH_BEARER_TOKEN` environment variable used
when loading an experiment from http with an authorization bearer token.
It takes precedence over the same information in the settings file if it is
defined there too.

Changed

- When env variables are provided, first take their values before loading the
configuration. This allows to have different scenarios stored outside the
experiment itself. [252][252]
- Allow to substitute `pauses` values with configuration or secret values

[252]: https://github.com/chaostoolkit/chaostoolkit-lib/issues/252

Changed

- Ensure experiment level controls are only played once

Changed

- Ensure experiment level controls are applied to activity level controls
when activity declares a control too [251][251]

[251]: https://github.com/chaostoolkit/chaostoolkit-lib/issues/251

Changed

- Ensure dynamic configuration can reference itself [250][250]

[250]: https://github.com/chaostoolkit/chaostoolkit-lib/issues/250