Translations:Release notes 0.20/145/en


 * The Extensions feature was added to the Adaptive operation. Pull request #4388
 * The Helix operation was refactored and Extra offset property was added to it. Pull request #5405
 * The check if the current schema is using minutes for velocity expression and appropriate warning were added. Pull request #6357
 * External threads were added to the thread milling operation. Pull request #6485
 * The stability of engraving on sketches was improved. Pull request #6394
 * The visibility of path objects was made more natural. Pull request #4911