Repin OCCTSwift floor to 1.17.0, picking up Pass 1a of OCCTSwift's #377/#380 duplication/bug-fix audit. No API or behaviour change here. Note: this repo's floor was actually already at 1.15.0 (5 commits ahead of the locally-recorded 1.8.0), so this release also carries whatever shipped between 1.15.0 and 1.17.0.