Colocation cleanup and update dev version number

[lewisblake]

Change Summary

Puts all colocation stuff in a colocation module. Updates the dev version to 0.20.dev0

Related issue number

NA

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.31%. Comparing base (af621d8) to head (186dbe0).
Report is 501 commits behind head on main-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1195      +/-   ##
============================================
+ Coverage     79.25%   79.31%   +0.06%     
============================================
  Files           129      131       +2     
  Lines         20220    20229       +9     
============================================
+ Hits          16025    16045      +20     
+ Misses         4195     4184      -11     

Flag	Coverage Δ
unittests	79.31% <100.00%> (+0.06%)	⬆️

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