Topo-descriptors

What's Changed
* Move from DataArray to Dataset for DEM object to allow transferring global attributes, add units as variable attributes, output slope in units of [degree] instead of [m / pixel], fix bug in slope calculation in https://github.com/MeteoSwiss/topo-descriptors/pull/8. THIS IS A BREAKING CHANGE
* Remove parallelization of valley and ridge index with multiprocessing for better cross-plateform compatibility in https://github.com/MeteoSwiss/topo-descriptors/pull/9


**Full Changelog**: https://github.com/MeteoSwiss/topo-descriptors/compare/v0.4.0...v0.5.0

What's Changed
* Remove deprecated np.int, add smoothed DEM as a descriptor by draimundo in https://github.com/MeteoSwiss/topo-descriptors/pull/7

New Contributors
* draimundo made their first contribution in https://github.com/MeteoSwiss/topo-descriptors/pull/7

**Full Changelog**: https://github.com/MeteoSwiss/topo-descriptors/compare/v0.3.0...v0.4.0

What's Changed
* Shift support to python 3.8, 3.9 and 3.10
* Faster TPI computation by frazane in https://github.com/MeteoSwiss/topo-descriptors/pull/5
* Notebook to readme by dnerini in https://github.com/MeteoSwiss/topo-descriptors/pull/6


**Full Changelog**: https://github.com/MeteoSwiss/topo-descriptors/compare/v0.2.1...v0.3.0

* Fix bug in the scale to pixel conversion in case of WGS84 grids.

**Full Changelog**: https://github.com/MeteoSwiss/topo-descriptors/compare/v0.2.0...v0.2.1

Changelog
------------

* Add STD descriptor, the standard deviation of elevation in a local neighborhood [[PR2](https://github.com/MeteoSwiss/topo-descriptors/pull/2)].
* Add Sx descriptor, a slope-based, direction-dependent parameter that describes the upwind topography at each location ([Winstral et al 2002](http://dx.doi.org/10.1002/hyp.1238)) [[PR#3](https://github.com/MeteoSwiss/topo-descriptors/pull/3)].
* The output directory is now passed as keyword argument `outdir` instead of being a configuration parameter [[commit be56151](https://github.com/MeteoSwiss/topo-descriptors/commit/be56151a9bd135c9acd29df51c6bce4dc7dfe87e)].
* Minor bug fixes and code improvements.

- Fix packaging