[processing] add points displacement algorithm
[processing] update points displacement alg to new ParameterVector syntax
[processing] add zonal statistics algorithm
[processing] add Points from polygons algorithm
[processing] add Points from lines algorithm (still needs some improvements)
fix rebase conflicts
[processing] add Points from vector algorithm
[processing] add Extract raster values to CSV algorithm
[processing] add Extract raster values to shapefile algorithm
[processing] add two Extract values models (for CSV and shape)