Feature/subpic

Biao Wangrequested to merge
biaowang/VVCSoftware_VTM:feature/subpic into master

implement first part of subpicture functionality.

  1. the mapping between slice and subpicture works as expected, with two more configuration files added
    • cfg/nonCTC-SliceConfigExamples/subpicture_4Slice2HorSubPic.cfg
    • cfg/nonCTC-SliceConfigExamples/subpicture_4Slice2VerSubPic.cfg
  2. decoder side check works (marco: SUBPIC_DECCHECK), by masking off unwanted subpictures and write only target subpicture
  3. for all intra pictures, subpicture treating boundaries as picture boundary works with the decoder side check test

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