We lower Case every Header coming from a CSV/Google Sheet

[DiegoPino]

And we probably should not

This makes ingesting things like ap:annotationCollection via a CSV impossible

@giancarlobi had the same issue a time ago (my birthday/ Allison helped there).

I found a few instances where we do this. Right now this is not a blocker and makes sense for data coming e.g from Solr but
for CSVs we should preserve case (and tell people to be careful/aware of the case).

The original idea was to avoid data ambiguity since in the past we had people not being careful between data.label and data.Label...

But as we move more into other vocabs/mixed vocals we need to allow mixed cases.

Most of the code responsible for this looks like this snippet

      $rowHeaders_utf8 = array_map('stripslashes', $rowHeaders);
      $rowHeaders_utf8 = array_map('utf8_encode', $rowHeaders_utf8);
      $rowHeaders_utf8 = array_map('strtolower', $rowHeaders_utf8);
      $rowHeaders_utf8 = array_map('trim', $rowHeaders_utf8);

@karomabiles @alliomeria can we discuss this? Thanks