Ravenpy

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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.

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This is an interim version making one step toward semi-distributed modeling support.
Model configuration is still in flux and will be significantly modified with 0.5.
The major change in this version is that model configuration supports passing multiple HRU objects,
instead of simply passing area, latitude, longitude and elevation for a single HRU.

* GR4JCN emulator now supports routing mode.
* Add BLENDED model emulator.
* DAP links for forcing files are now supported.
* Added support for ``tox``-based localized installation and testing with python-pip.
* Now supporting Python 3.7, 3.8, and 3.9.
* Build testing for ``pip`` and ``conda``-based builds with GitHub CI.

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* Update external dependencies (Raven, OSTRICH) to facilitate Conda packaging.