WIP code for move of vector features positions by X and Y values given in two raster maps. This can move linear features without breaking the visual connection as points falling into the same raster cell are shifted by the same value.

Alternative name would be v.rast.move because the big deal is that it is using raster to do the moving.

The one example included now shows the principle, moves in X direction both ways depending on the raster values. My use case is randomizing a set of lines (connected and not connected).

Feedback welcome.

…rtant role and it now moves vertices (points) of lines, not points.

…nt null check is needed).