Add proximity computation tool

[nmaarnio]

A tool similar to distance_computation is wanted that processes the result raster further. This tool would start with running distance computation but further process the resulting raster so that it would have high values close to the geometries of interest. The values would also (have to) be scaled and a maximum distance defined (the distance at which pixels will be 0).

Name could be proximity_computation or proximity_to (distance_computation could be renamed to distance_to too).

Inputs:

• geodataframe
• raster profile
• max distance (not optional, unlike in distance_computation)
• scaling method (linear, logarithmic, binary? linear being the default one)

[nmaarnio]

Closing as this tool has been implemented