better import of 'elephant foot' (spelled elefant in prusa) that is now first_layer_size_compensation, using 'legacy to amke the convert.
advantage: it reverse the sign now.
drawback : no easy export to prusa.
also some merge for creality printers, and fix some problem in it.
relax the min/max version for the profile, i don't have the resource to check & modify these for each release.
