Magnetic lasso

[VNVetrov]

I use labelme a lot and I get bored if I comment for more than 3 hours, so I thought it might be interesting and it might make annotation easier if I add a feature like the magnetic lasso tool from Photoshop. I have already found an algorithm that allows you to create such a tool. This is called Marching Squares (https://en.wikipedia.org/wiki/Marching_squares ). I'm going to try realize it, maybe you'll be interested too.