Resolve "Adapt TG-auth code to PHP8"

Stefan E. Funkrequested to merge
142-adapt-tg-auth-code-to-php8 into develop

Closes #142 (closed)

Before merge must successfully run:

  • TG-auth-Tests
  • TG-crud-Tests
  • Login TG-lab (TextGrid-WebAuth.php)
  • Login TG-rep (TextGrid-WebAuth-GetSid.php)
Edited by Stefan E. Funk

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