Island Regeneration Scheduling Enhancements

[Mohron]

• Automated Island Cleanup can be configured to only run if less than x players are online
• Automated Island Cleanup will run one island at a time
• Automated Island Cleanup will not run if a previous task is still running
• Island Reset can be configured to use a new island for the player and queue their existing island for cleanup
• Island Deletion can be configured to queue their existing island for cleanup