Add more trimming possibilities

[adam-urbanczyk]

• polyline trim
• pcurve construction
  • edgeOn
  • wireOn
  • faceOn
• curved trim as an overload
• tests
• make _uvBounds, _Bounds "public"
• docs

Advanced stuff for users living in the (u,v) space:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.96%. Comparing base (2ad954c) to head (1a9cdac).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1833      +/-   ##
==========================================
+ Coverage   95.56%   95.96%   +0.40%     
==========================================
  Files          28       28              
  Lines        7346     8274     +928     
  Branches     1110     1358     +248     
==========================================
+ Hits         7020     7940     +920     
- Misses        195      203       +8     
  Partials      131      131              

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[lorenzncode]

LGTM! faceOn with thicken looks useful for say 3D text.

base = sphere(5)
face_text = faceOn(base.faces(), text("CadQuery", 1))
result = base - compound([f.thicken(-0.1) for f in face_text.Faces()])

[jmwright]

Looks good, thanks @adam-urbanczyk !