Wavespectra

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New Features
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* Support ERA5 netcdf files from the new cds api which have different naming conventions.
* New utils function to calculate a logarithmic frequency array.
* Generalise the generation of the spectral coordinates in read_era5 to support different
spectral grids, e.g., files from the operational ECMWF wave model.

Breaking Changes
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* read_era5 no longer supports the `freqs` and `dirs` arguments. It now accepts `f0` and
`df` arguments, defaulting to 0.03453 and 1.1, respectively.

Internal Changes
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* Update documentation to include missing util functions.

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New Features
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* New `weight_coeff` option in the ndbc readers to avoid negative energy density in the
2D spectra by `lubyant`_ (`PR143 <https://github.com/wavespectra/wavespectra/pull/143>`_).

.. _`lubyant`: https://github.com/lubyant

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Internal Changes
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* Bug fixes to allow writing swan ascii files from spectra with no time or site dims.

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Breaking Changes
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* Remove `dset_lons` / `dset_lats` variables from the select methods. These variables
were not necessary and were only defined to support some legacy chunking issues.

Internal Changes
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* Support datasets with different coordinate names in the select module.
* Support lons/lats specified as scalars in the `SpecDataset.sel` method.
* Add new github workflow to test the package on push on different OS with different python versions.

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Internal Changes
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* Rename specpartc to specpart to try and fix inconsistencies in module definition.

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New Features
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* New reader for Nortec AWAC files by `Ruben de Bruin`_ (`PR137 <https://github.com/wavespectra/wavespectra/pull/137>`_).
* New reader for Datawell buoy files (`PR135 <https://github.com/wavespectra/wavespectra/pull/135>`_).
* Allow reading spotter buoy files as 2D spectra (`PR134 <https://github.com/wavespectra/wavespectra/pull/134>`_).

Internal Changes
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* Changes to the csv and json spotter readers to optimise and standardise them.