Arcanna.AI remove Arcanna.Event output_prefix since it is redundant

[marian-craciunescu]

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[yaakovpraisler]

Thank you for your contribution. Your generosity and caring are unrivaled! Make sure to register your contribution by filling the Contribution Registration form, so our content wizard @yaakovpraisler will know the proposed changes are ready to be reviewed. For your convenience, here is a link to the contributions SLAs document.

@marian-craciunescu Please fill in the form so I can start reviewing, thanks.