This fixes an issue where the row number reported by import error logs would be off by 1 or 2 depending on whether the first row was labelled as titles or not.
As arrays start at 0 in PHP, `$firstRowTitles = false` would result in reported row numbers being off by one less than their actual number. If `$firstRowTitles = true`, the reported row number would be off by two less than their actual number (one for the zero index, one for the first row not existing in the `$results` set).
In contrast to the preview CSV reader, the actual ``ImportModel`` did not respect any encoding values provided. This leads to bugs with any non utf8-compliant characters. This PR fixes the problem by adding the appropriate encoding filter (copied from the preview reader).
Luke Towers
Samuel Georges
Quezler
Justin Lau
Alexander Guth
Jérémy Gaulin
flynsarmy