ResidenceList

• feat(storage) Support MySQL storage, with shared player settings and separate residence data for each server. [#29](https://github.com/ArtformGames/ResidenceList/issues/29)
• feat(visitors) Record unique visitors, excluding residence owners. Store each visitor's UUID, name, and latest visit time. [#136](https://github.com/ArtformGames/ResidenceList/issues/136)
• feat(view) View visitor history from residence details and management pages, and sort residences by visitor count. Visitor icons can be configured separately for each page.
• feat(papi) Add %residencelist_visitors_<residence>% to display the unique visitor count.
• perf(storage) Cache data and perform storage operations asynchronously. Save visitor changes in batches every 60 seconds by default, and flush pending changes on shutdown.
• fix(data) Fix deleted comments reappearing after restart. Improve data handling during reconnects, residence renames, deletions, and failed saves.
• fix(view) Fix leftover empty-state icons and page selection when switching between lists.
• chore(deps) Update XSeries, PlaceholderAPI, bStats, database dependencies, and build tools.

YAML remains the default storage, and existing YAML data is supported. Switching to MySQL does not automatically import YAML data.

When sharing a MySQL database, assign each server a unique top-level server-id. If left blank, the server's listening port is used.

Configure the visitor save interval with settings.visitor-save-interval-seconds. Restart after changing storage settings or the save interval.

For developers: ResidenceData.renameTo(File) has been removed; use ResidenceManager.renameResidence(...) instead. Visitor APIs and asynchronous storage initialization and flush methods are now available.

Full Changelog: [1.3.8...1.4.0](https://github.com/ArtformGames/ResidenceList/compare/1.3.8...1.4.0)