fix incorrect coordinate system of glTF exports

[uki-dev]

correctly exports glTF in right-handed +Y up coordinate space as defined in the glTF specification

before:

after:

[uki-dev]

AssemblyProtocol.loc is seemingly read-only , are there any other recommendations on how i could address this ?

[codecov]

Codecov Report

Merging #1211 (f27883d) into master (e23f43d) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1211      +/-   ##
==========================================
+ Coverage   94.01%   94.07%   +0.06%     
==========================================
  Files          26       26              
  Lines        5414     5421       +7     
  Branches      919      919              
==========================================
+ Hits         5090     5100      +10     
+ Misses        193      190       -3     
  Partials      131      131              

Impacted Files	Coverage Δ
cadquery/occ_impl/assembly.py	98.44% <100.00%> (+0.02%)	⬆️
cadquery/occ_impl/exporters/assembly.py	100.00% <100.00%> (ø)
cadquery/cqgi.py	80.73% <0.00%> (+1.22%)	⬆️

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[jmwright]

Thanks for the contribution @uki-dev !

[lorenzncode]

I tested the change - importing to Blender, CAD Assistant, Mayo, and PlayCanvas.

All displayed the model in the desired orientation by default except for Mayo. For Mayo, the GLTF Import option "System Coordinates Converter" can be changed from the default of "Undefined".