fix for MR !1236

Karsten Suehringrequested to merge
ksuehring/VVCSoftware_VTM:fix-mr1236 into master
  • compile fix for macOS
  • initialize rectangular slice map before using it for subpictures

Note: I created accessor functions for m_subPicID (which was unused), because I expect it to be used in the future. It should be removed, if it's not used.

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