offset2D for construction

[marcus7070]

Will close #618.

I added a new example that covers offset2D as well.

[codecov]

Codecov Report

Merging #639 (71fd991) into master (3505fc2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #639   +/-   ##
=======================================
  Coverage   94.02%   94.03%           
=======================================
  Files          31       31           
  Lines        6627     6636    +9     
  Branches      724      726    +2     
=======================================
+ Hits         6231     6240    +9     
  Misses        258      258           
  Partials      138      138           

Impacted Files	Coverage Δ
cadquery/cq.py	89.89% <100.00%> (+0.04%)	⬆️
tests/test_cadquery.py	99.13% <100.00%> (+<0.01%)	⬆️

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[marcus7070]

Ready for review now.

[jmwright]

@marcus7070 Thanks for putting this together. Feel free to request a review or just let us know when this is ready. I see the checks are still running right now.

[jmwright]

Whoops, we hit Comment at the same time.

[jmwright]

@marcus7070 I think it looks good, thanks!

We can merge after @adam-urbanczyk has had a chance to review and comment.

[jmwright]

@marcus7070 I think once the conflicts are resolved we can merge.

[jmwright]

Thanks @marcus7070 !