Draft: [feat] Detect background and moving object

To do:

• refact code structure, make gaussian, gaussian mixture class internal
• analyse livox scan pattern
• add reset detection button
• sort cluster id by distance
• Compute cluster info
• Display bounding box
• Add frame info in cluster output
• Classification of clusters by geometry
• Use omp
• improve display
• add vtk test
• improve background detection
• test mid360 data - [ ] change cout to vtkwarning
• Add algorithm description in MR
• Make extract cluster as an independent filter

Notes: number of points detected by livox hap on function of the distance video

Runtime test On velodyne vlc-32C data before omp: EstimateMotion ~0.024s ExtractCluster ~0.06-0.2s