Final shape / free func tweaks

[adam-urbanczyk]

• sample
• isoline
• detailed check output
• expose API in func: from cadquery.func import *
• tests

[codecov]

Codecov Report

Attention: Patch coverage is 96.49123% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.33%. Comparing base (6b3b14a) to head (4117a93).

Files with missing lines	Patch %	Lines
cadquery/occ_impl/shapes.py	96.15%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1731   +/-   ##
=======================================
  Coverage   95.32%   95.33%           
=======================================
  Files          27       28    +1     
  Lines        6788     6842   +54     
  Branches     1013     1025   +12     
=======================================
+ Hits         6471     6523   +52     
- Misses        193      194    +1     
- Partials      124      125    +1     

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[lorenzncode]

I like the new free func import method!