Allow hostname in SPF wizard

Webslicerequested to merge
webslice/ispconfig3:feature/5329-spf-wizard-for-txt-records into stable-3.1

Fixes #5329 (closed) , #4051 (closed), #4797 (closed), #5108 (closed), #4317 (closed), #5359 (closed)

Based off !955 (closed) to prevent merge conflicts

Edited by Marius Burkard

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