v3 first alpha release (finish the huge refactor)

[sophiedeziel]

This issue is to track what's done and what's in flight to have a first alpha release of v3.

Keeping this issue up to date will help in listing out the breaking changes for the migration documentation

The temporary v3.x branch should be merged in develop as soon as it is in a releasable state:
Diff of v3.x with develop: #225

Todo

MVP to merge the v3.x branch on develop

• Refactor to introduce new primitives Introduce an interpreter to extract command interpretation logic #211
  • More performant indexing paths for rendering Improve the paths subsets of jobs #220
    • Bring back the layer split tolerance Bring back the tolerance logic #224
  • bring back min/max/single layer support Use clipping to render layers with startLayer and endLayer #234
  • bring back layer height setting Wire up extrusionWidth and lineHeight used for building tube geometry #227
  • bring back line width setting Wire up extrusionWidth and lineHeight used for building tube geometry #227
  • bring back renderExtrusion and renderTubes Wire up renderExtrusion and renderTubes #228
  • Remove the Code enum Remove the Code enum #229
  • Bring back the layer class Bring back a representation of layers #233

New features

• Implement G21 Implement G21 (targeted on v3.x branch) #218
• Implement G28 Implement G28 (targeted on v3.x branch) #219

Breaking changes

• Layers are accessible via preview.job.layers instead of preview.layers. It returns Path[][] instead of Layer[]
• preview.currentToolColor() deleted
• ... (list here the deletion of deprecated methods/attributes)