Index-calculator

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Internal Changes
~~~~~~~~~~~~~~~~

* added ``.zenodo.json`` workflow (:pull:`63`)
* update ``pre-commit`` workflow (:pull:`62`)
* update tests for ``xclim>=0.49`` (:pull:`57`, :pull:`61`)
* add ``dependabot.yml`` (:pull:`51`)

New Indicators
~~~~~~~~~~~~~~

* GSL: growing season length (:pull:`67`)

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Internal Changes
~~~~~~~~~~~~~~~~

* updates of build system (setuptools is deprecated) (:pull:`40`)
* using `pyproject.toml <https://stackoverflow.com/questions/62983756/what-is-pyproject-toml-file-for>`_ file instead of ``setup.py``
* using `setuptools_scm <https://github.com/pypa/setuptools_scm>`_ for automatic updating of version numbers.
* updates of ``pre-commit`` hooks.
* indicator UTCI: set default stat from ``average`` to ``sunlit`` (:pull:`36`)

New Indicators
~~~~~~~~~~~~~~

* CMD: calm days

Documentation
~~~~~~~~~~~~~

* how to implement a new project
* how to implement a new indicator

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* correct CIname
* make indices classes callable
* split ``_indices.py`` into ``_inidices.py`` and ``_climate_indicator.py``
* make conversion indices possible

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* convert time frequencies to requested time frequency
* rename variable name(s) to requested variable name(s)
* convert input variable(s) to requested input variable(s): sfcWind, snd
* SCD: set default threshold to ``3mm day-1``
* set left and right bounds for ``yearAC`` (yyyy1-07-01 to yyyy2-06-30) and for ``yearHydro`` (yyyy1-09-01 to yyyy2-08-31)
* new ERA5 DRS structure and file naming convention
* type of components in ``pjson`` from ``str`` to ``list``

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* calculate indices with neagtive thresholds

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* new drs format and file naming convention for project E-OBS