Fixes

- fix: Don't ommit flag int input in no permission message (# 3466)
- Fix: `Plot#getOwner` can be nullable, and redstone may be present on unowned plots (# 3472)
- Fix the set block timer if the queue is not empty (# 3474)
- PlayerInteractEvent does not necessarily interact with a block (# 3463)
- Fix: Missing Component returns + plot info on unknown plot owner (# 3449)

Features

- feat: unknown owner(s) for plot expiry (# 3452)
- feat: plot-title flag value should allow single values (# 3410)

Changes

- Align plugin's java version with API java version - Java 17 (# 3468)
- feat: add worldname to the notify flags (# 3457)

Documentation updates

- Separate linked javadocs per module (# 3476)
- Add `@since` annotation for v6 API changes (# 3471)
- Address dangling `@see` tags (# 3469)
- Unify true/false style in `@return` javadoc (# 3470)

Full changelog: https://github.com/IntellectualSites/PlotSquared/releases/tag/6.4.0