Renaming the package

[davidorme]

Description

This PR implements #391:

• Code references changed (both imports and sphinx references)
• Text references to rainforest in docs and docstrings updated.
• Package directory moved.
• vr_run function renamed to ve_run. For some reason, I don't like that name, but we can fix that later!
• RTD set up to build the branch to preview: https://virtual-rainforest.readthedocs.io/en/391-rename-the-package/

Still to do:

• Rename the repo.
• Update other repos
• Update the RTD settings to build to the new website name
• Publish a draft package version to occupy the namespace on PyPi

Fixes #391

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• [-] Code is commented, particularly in hard-to-understand areas
• [-] Tests added that prove fix is effective or that feature works

[davidorme]

Oh great. #390 has started affecting the Mac OS runners.

[vgro]

LGTM. Just a few minor comments.
Thanks for the huge effort! Quite cool to see ow much code we have created over the last two years :-)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.21622% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 93.18%. Comparing base (8220f21) to head (6677c7a).

Files	Patch %	Lines
virtual_ecosystem/entry_points.py	91.66%	1 Missing ⚠️
...le_data/generation_scripts/climate_example_data.py	0.00%	1 Missing ⚠️
..._data/generation_scripts/elevation_example_data.py	0.00%	1 Missing ⚠️
...ple_data/generation_scripts/litter_example_data.py	0.00%	1 Missing ⚠️
...mple_data/generation_scripts/plant_example_data.py	0.00%	1 Missing ⚠️
...ple_data/generation_scripts/runoff_example_data.py	0.00%	1 Missing ⚠️
...ample_data/generation_scripts/soil_example_data.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #392   +/-   ##
========================================
  Coverage    93.18%   93.18%           
========================================
  Files           60       60           
  Lines         2920     2920           
========================================
  Hits          2721     2721           
  Misses         199      199           

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[TaranRallings]

LGTM!

We have written quite a bit of code!