Though arguably non-ASCII text fields in the VLR header
(user_id and description) are not within spec, we shouldn't barf
if we come across them. This commit relaxes to allow non-ASCII
text fields via a new as_las_string_lossy method. This method
first tries to convert using the more restrictive as_las_str method,
falling back on String::from_utf8_lossy if it's not valid text.
Though arguably non-ASCII text fields in the VLR header (
user_idanddescription) are not within spec, we shouldn't barf if we come across them. This commit relaxes to allow non-ASCII text fields via a newas_las_string_lossymethod. This method first tries to convert using the more restrictiveas_las_strmethod, falling back onString::from_utf8_lossyif it's not valid text.Closes #24.