[NF] Discord Integration

[NF] Discord Integration 2.8.7

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Initial support for XenForo 2.3.
- Harden function to get Discord server mapping.
- Fix group sync position tracking not being displayed correctly.
  • Add initial support for cross-posting content to Discord forum channels.
  • Adjust column types for various columns to account for older MySQL versions.
  • Fix "Include replies made to threads" option not being set.
  • Fix "Enable syncing of XenForo bans with Discord bans" was not respected.
  • Fix new/re-opened report notifications being flipped.
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