Fix multisection sweep for sketches

[adam-urbanczyk]

Fixes #1407, #1397

[codecov]

Codecov Report

Merging #1408 (ec312a9) into master (d780127) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head ec312a9 differs from pull request most recent head 24fe97f. Consider uploading reports for the commit 24fe97f to get more accurate results

@@           Coverage Diff           @@
##           master    #1408   +/-   ##
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  Coverage   94.19%   94.20%           
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  Files          27       27           
  Lines        5740     5745    +5     
  Branches      983      986    +3     
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+ Hits         5407     5412    +5     
  Misses        199      199           
  Partials      134      134           

Files	Coverage Δ
cadquery/cq.py	92.34% <100.00%> (+0.01%)	⬆️
cadquery/occ_impl/shapes.py	93.09% <100.00%> (+0.01%)	⬆️

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[lorenzncode]

LGTM! Since the inner wires are ignored in multisection sweep, this may be another use case for a shell thicken method (#1269) as in:

result = (
    cq.Workplane()
    .placeSketch(sketch1.moved(p.locationAt(0)), sketch2.moved(p.locationAt(1)))
    .sweep(p, multisection=True, makeSolid=False)
    .val()
    .thicken(2)
)

[jmwright]

Thanks @adam-urbanczyk !