MeanShift3D draft

Signed-off-by: Nikolay Lyalyushkin <nikolay.lyalyushkin@intel.com>
easy test workes
Refactored MeanShift3D (used Point3f instead of Mat)

added simple test with four 2D test (passed)
First experiments with PseudoRansac. Found some adequate parameters

Tracker is slow and does not track as necessary. Added more complicated
test for MeanShift.