Ravenpy

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* Add support for EvaluationPeriod commands. Note that as a result of this, the model's ``diagnostics`` property contains one list per key, instead of a single scalar. Also note that for calibration, Ostrich will use the first period and the first evaluation metric.
* Add ``SACSMA``, ``CANADIANSHIELD`` and ``HYPR`` model emulators.

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* Simplify RVC configuration logic.
* Add ``ravenpy.utilities.testdata.file_md5_checksum`` (previously in ``xarray.tutorial``).

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* Some adjustments and bugfixes needed for RavenWPS.
* Refactoring of some internal logic in ``ravenpy.config.rvs.RVT``.
* Improvements to typing with the help of mypy.

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* Refactoring of the RV config subsystem:

* The config is fully encapsulated into its own class: ``ravenpy.config.rvs.Config``.
* The emulator RV templates are inline in their emulator classes.

* The emulators have their own submodule: ``ravenpy.models.emulators``.
* The "importers" have been renamed to "extractors" and they have their own submodule: ``ravenpy.extractors``.

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* Update to RavenC revision 318 to fix OPeNDAP access for StationForcing commands.
* Fix grid_weights set to None by default.
* Pass nc_index to ObservationData command.
* Expose more cleanly RavenC errors and warnings.

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* Add notebook about hindcast verification skill.
* Add notebook about routing capability.
* Modify geoserver functions to have them return GeoJSON instead of GML.
* Collect upstream watershed aggregation logic.
* Fix RVC bug.