Sort modules and extensions alphabetically

[Thomsch]

Description

Unsorted extensions and modules list makes it hard to maintain and can cause merge conflicts when merged to develop.

Changes

This pull request sorts alphabetically:

• The list of Sphinx extensions
• The list of orion modules in setup.py
• The list of orion modules in conda/meta.yaml

Checklist

Tests

• All new and existing tests are passing ($ tox -e py38; replace 38 by your Python version if necessary)

Documentation

• I have updated the relevant documentation related to my changes

Quality

• I have read the CONTRIBUTING doc
• My commits messages follow this format
• My code follows the style guidelines ($ tox -e lint)

[codecov-commenter]

Codecov Report

Merging #443 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #443   +/-   ##
========================================
  Coverage    49.01%   49.01%           
========================================
  Files           81       81           
  Lines        13660    13660           
  Branches       329      329           
========================================
  Hits          6695     6695           
  Misses        6948     6948           
  Partials        17       17           

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