Import: add new implementation of STEP importer/exporter

For better supporting Link and groups. The original implementation can
still be used by uncheck the STEP import setting 'Use Link Group'.
This commit is contained in:
Zheng, Lei
2019-07-12 12:14:00 +08:00
committed by wmayer
parent e90d09dc40
commit a460fdc8b6
9 changed files with 2428 additions and 533 deletions

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