This version brings the following features:

• Update to CloudCompare 2.12.1 (may 7, 2022)
• Fix the doc on RANSAC_SD, primitives types.
• Add option for las/laz version (1.4) (issue #32), see test020.py.
• Plugin PCL (issue #35) see test038.py.
• Mesh triangles iterator functions (issue #36), see test011.py.
• Cut a mesh with a polyline (Crop2D) (issue #38) see test039.py.
• Add functions to handle display state of colors and scalar fields (for save in .bin and opening in GUI) (issue #43).
  See methods in base classes for point clouds: showColors, showSF, showNormals...
• Various small fixes.
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