Compatibility with schema 217

[leendertvanwolfswinkel]

• [ ] Change required schema version to 217

• [ ] Handle renamed fields:

  height -> vegetation_height height_file -> vegetation_height_file

  stem_count -> vegetation_stem_count stem_count_file -> vegetation_stem_count_file

  stem_diameter -> vegetation_stem_diameter stem_diameter_file -> vegetation_stem_diameter_file

  drag_coefficient -> vegetation_drag_coefficient drag_coefficient_file -> vegetation_drag_coefficient_file