Laplacian edge detection

[rhobro]

Would it be possible to add this algorithm to the edge detection list?

[thecodergus]

I'm thinking to make this in the next months.

[theotherphil]

Sounds good, thanks

[thecodergus]

I've set up the algorithm in a random project here. This weekend or the next, I should submit a PR after carefully analyzing how things are being structured within the project. I tried to use only native functions that already exist in the project.