Cpp region growing

[DimasfromLavoisier]

Added function for supervoxel segmentation with minor changes for several other functions. There still issue with python part that I'll fix.

[codecov-commenter]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (fbef6fd) 74.84% compared to head (7daa7a1) 75.83%.

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