Initial implementation of cq.Shape selectors

[adam-urbanczyk]

• Implementation
• Tests
• Docs
• Refactor - move more stuff to shape (?)

[codecov]

Codecov Report

Merging #1406 (038cbe7) into master (d780127) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1406      +/-   ##
==========================================
+ Coverage   94.19%   94.23%   +0.03%     
==========================================
  Files          27       28       +1     
  Lines        5740     5779      +39     
  Branches      983      984       +1     
==========================================
+ Hits         5407     5446      +39     
  Misses        199      199              
  Partials      134      134              

Files	Coverage Δ
cadquery/occ_impl/shape_protocols.py	100.00% <100.00%> (ø)
cadquery/occ_impl/shapes.py	93.15% <100.00%> (+0.07%)	⬆️
cadquery/selectors.py	98.88% <100.00%> (+<0.01%)	⬆️

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[jmwright]

@adam-urbanczyk This PR is still marked as draft. Is this an interim review, or a final review? All the tests are in place and pass, so I wondered if maybe the intent was to take the PR out of draft.

[adam-urbanczyk]

@adam-urbanczyk This PR is still marked as draft. Is this an interim review, or a final review? All the tests are in place and pass, so I wondered if maybe the intent was to take the PR out of draft.

I forgot to undraft it.

[jmwright]

Things seem to work well as far as I can tell. Thanks @adam-urbanczyk !

[lorenzncode]

I did some testing with the PR branch and did not find any issue. Thanks @adam-urbanczyk !