Summary

• Add PG (Panzergewinde / DIN 40430) 80° thread profile command with presets PG 7–PG 48, addressing Feature Request: PG threads #79
• Add British Metrics PG chart link to Open Online Calculator
• Bump version to 2.00 and document the new command in README

Notes

• Profile follows the existing Bottle/Buttress pattern (custom radius sample arrays + presets)
• External presets include 0.15 mm print clearance (same idea as bottle presets); minor diameter remains adjustable
• Source dimensions from the British Metrics PG chart / Sealcon catalog referenced in Feature Request: PG threads #79

Test plan

• Install/load workbench from this branch in FreeCAD
• Create PG thread profile; default should be PG 13.5 External
• Switch presets PG 7–PG 48 and verify Pitch / MinorDiameter update
• Make Helix + Do Sweep for External and Internal
• Open Online Calculator → PG chart opens British Metrics page
• Confirm toolbar icon is present and distinct from Bottle (light blue)

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