xF2 Add-on Warning Improvements by Xon 2.11.4

Thanks to @Recep Baltaş for funding this feature update

• Allow "hourly" option for warnings, warning definitions, and warning actions.
• Better compute the effective expiry date of warning actions when using "at or above point threshold" based off warning expires.
• Add option to control redirect after issuing a warning (to content or reported last referrer)
• Improve installer robustness when XF1 legacy placeholder add-on is removed.

This add-on is no longer in beta and can be considered feature complete and stable.

Changes from beta:

• Only send warning email if the user has an email address
• Fix category sorting
• Add {userId} as replacable for warning conversation
• On issuing a warning, redirect back to the content via the getContentUrl() instead of referrer
• Display user's warning count on the "previous warning" bar, make the previous warning count configurable (default 5) and link to the rest of the warnings if not all are displayed.

• Improve installer
  • Ensure phrases are not reset on upgrades
  • Setup defaults for the Custom Warning on install
  • Tweaks to prevent unexpected __conflict column renames on upgrade

Note; this is likely the last release candidate baring unexpected bugs.

• Fix "Cannot use \XF\Entity\User As User because the name is already in use"

• Fix being unable to save display order for warning definitions
• Fixes to posting various warning/warning summaries to threads (new & existing)
  • Respect the user settings or default user to post as
  • Ensure notifications are sent
  • Default forum prefixes are respected