cq.Shape and some free-func improvements

[adam-urbanczyk]

• paramAt for position [consistency]
• isSolid fix [bugfix]
• solid improvements [free-func]
• check [free-func]
• innerShells [consistency]
• outerShell [consistency]
• tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.23%. Comparing base (5429f61) to head (de5cc76).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1672      +/-   ##
==========================================
+ Coverage   95.15%   95.23%   +0.07%     
==========================================
  Files          27       27              
  Lines        6485     6521      +36     
  Branches     1346     1352       +6     
==========================================
+ Hits         6171     6210      +39     
+ Misses        191      187       -4     
- Partials      123      124       +1     

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[eguiraud-pf]

thank you @adam-urbanczyk , this would be enabling :)

[rherrero-pf]

Excellent! This would help with our work @adam-urbanczyk

[jons-pf]

@adam-urbanczyk Thanks for this PR!

[lorenzncode]

Looks good, no other issues found in limited testing.

[jmwright]

Looks good, thanks @adam-urbanczyk !

[adam-urbanczyk]

Alright, merging.