Option to teleport the visitors back to their islands (or spawn) if PvP is toggled on

[Poslovitch]

Description

Is your feature request related to a problem?

Suggested by dimi219 in DM on Discord.

Although there is a cooldown on the PVP flags, and the Invincible Visitors protection, these can be abused. More specifically, the Invincible Visitors protection is too broad for some users' needs, and as such they might not want to protect visitors from some types of damage, therefore making them vulnerable to PvP.

Describe the solution you'd like us to implement.

I still wonder if this should be made an option in the config or a world_setting flag. Any ideas?

Upon the player enables PvP on his island, the visitors in the affected dimensions are:

• told that PvP was enabled and as such they are going to be teleported after a slight delay.
• teleported back to their islands (if they have any), or the server's spawn.

Describe alternatives you've considered.

None.

Additional context

None.