select Move to Junk before/after custom filters

Jesse Norellrequested to merge
jnorell/ispconfig3:move_to_junk into stable-3.1

Add select option to Move to Junk before vs. after custom filters, with default to "before".

Fixes #4664 (closed) Fixes #2504 (closed)

Also makes autoresponder start/stop dates optional.

Fixes #5674 (closed)

Edited by Jesse Norell

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