[Xon] Proxy Link-Forum 2.4.1

Converts link forums into proxies for actual forums, allowing post information, post counts, etc from the destination forum to be visible when viewing the link-forum.

Note; only works as-expected for destinations which are a Forum (not a page or anything else). Does not have much in the way of input validation.

To a front-end user, a link forum can be made nearly indistinguishable to a normal forum.

Performance Impact
This causes 1 extra query if there are link-forums on the...

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Fix destination forum view checks where not always performed before displaying information from that forum
Fix destination forums would not always be considered for quick search or via the "Search sub-forums as well" feature
Inject if a link forum is a proxy in the node list & node permission list

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Compatibility fix for ElasticSearch Essentials auto-complete when Gift Upgrades is also installed

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XenForo 2.2.4 compatibility update

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Compatibility fix for ElasticSearch Essentials auto-complete when Gift Upgrades is also installed

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• Fully remove XF2.0 support
• Proxied node stats are now correctly propagated
• Add category support, thanks @Lukas W.

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• Fix template error on node list page when marking a link proxy forum as a proxy

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• Require php 7.2
• XenForo 2.2+
• Add per-link-forum "Include proxied forum in search results" option (default true)
• Fix "Search sub-forums as well" did not include proxied forums/categories

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• Remove unused template modification
• Fix proxied forums/categories did not display stats from the sub-forums of the proxied forum/category

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• Reduce number of joins when fetching proxied forum data
• Make proxy link forums excluded from XF permission building, and push view check to proxied forum/category.
  This eliminates the overhead on permission rebuilding on adding proxy link forums to the node-tree.
• Known issue of disabling a proxy link forum from proxying doesn't cause permissions to be rebuild for the node.

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• Fix "LogicException: Must provide at least 1 metadata value" when a crafted search url using a non-existent forum

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