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Draft: Centralise Gullwing/DFN/QFN pin 1 silk size calculations

John Beard requested to merge johnbeard/kicad-footprint-generator:vlga_silk into master

Use the same heuristic in the Nolead (QFN/DFN/LGA) generator as the Gullwings. This avoids surprisingly large arrows in parts with large pitches relative to the pads (e.g. VLGA-4 2x2.5mm). Centralise the function in the drawing_tools module for use in both the Nolead and Gullwing generators.

Also includes a fix to the VLGA-4 2.5x2mm: fix YAML min/max definitions - minimum was listed twice, maximum omitted. But this doesn't produce a change in the output.

This is the result for the VLGA-4 part - due to the large pads it's still slightly large:

image.png

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