IOSync

This update is focused on a few key points for stability.

A long-standing issue involved players getting their spawn point reset on a server where this plugin was first installed. This is no longer the case; people will reappear right where they expect it. This also makes the plugin more resilient in case of an unexpected data loss.

The bed respawn positions might not have been saved properly on servers running 1.21.5+, this has been fixed. Compatibility with servers running up to 1.21.4 has been kept.