Add support for laplace based hash based on Fei et. al

[KilianB]

https://researchportal.port.ac.uk/portal/files/4474930/Real_time_Visual_Tracking_Based_on_Improved_Perceptual_Hashing_Revised_.pdf

And take a look at feature extraction and feature tracking.

[KilianB]

LHash currently looks like simply performing an aHash or mHash with a kernel prepossessing. Maybe useful for motion tracking in videos.