Update structure support (#2593)
* Update structure support
* Meta fixups
* Update deprecation date
* More info in `server.structures`
* One-line values in `Structure lookups`
* Fix typo in tag syntax
* Minor meta improvements
* Add version to deprecation notes
* Add examples
* Remove `LocationTag.find_structure_type`
* Update deprecation message
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commit: d88b22f)
