Issue #59750 by quietone, larowlan, mikeryan, quicksketch, sreynen, kleinmp, kim.pepper, Bèr Kessels, chx, S3b0uN3t, ravi.shankar, mrddthi, webchick, neclimdul, Lendude: Required flag on file forms breaks on validation

Issue #1922814 by Berdir, Damien Tournoud, pwolanin, David_Rothstein, Heine, Bèr Kessels: Fixed Denial-of-service vulnerabiility in Image module.

- Patch by #1577 by chx, boombatower, Bèr Kessels, kkaefer: made SSL support a bit easier by providing two cookies and ... hook_goto_alter.