Make StandardBox courtyard clearance configurable
This was hard-coded to 0.25mm, which is usual, but not always correct, especially for large modules with large tolerances, or if used for connectors.
The default remains 0.25mm
This was hard-coded to 0.25mm, which is usual, but not always correct, especially for large modules with large tolerances, or if used for connectors.
The default remains 0.25mm