Package cleanup and updates

[Cadair]

The goal of this PR is to lay the ground work for updating to new versions of Python. Make the CI all pass and generally try and declutter a little.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (41246da) 99.16% compared to head (af4bad3) 98.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2010      +/-   ##
==========================================
- Coverage   99.16%   98.99%   -0.17%     
==========================================
  Files          83       83              
  Lines        5395     5393       -2     
==========================================
- Hits         5350     5339      -11     
- Misses         45       54       +9     

Files	Coverage Δ
opsdroid/__init__.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[oleg-fiksel]

Looks good to me. 👍 It would be good to have another opinion if we should remove the video property test or not. Or, maybe, rework it.

[jacobtomlinson]

Sorry I totally missed this PR when cleaning things up here this morning. I've superseded this with updating versioneer and with the CI fixes in #2020. Given the number of conflicts I've opened #2029 to extract the olm changes from here, so I'm going to close this out.