Request confirmation when /is sethome is used while being in the Nether/End

[Poslovitch]

Is your feature request related to a problem? Please describe.
People can get stuck in the Nether or in the End if they do /is sethome there.

Describe the solution you'd like
A confirmation should be requested if the player executes this command while not being in the Overworld.

TODO List

• Make command to be confirmable
• Add requireConfirmationToSetHomeInNether and requireConfirmationToSetHomeInTheEnd in WorldSettings
• Update command accordingly
• Add texts to explain the confirmation request
• Add allowSetHomeInNether and allowSetHomeInTheEnd in WorldSettings
• Make the command use these two new settings
• Test the tests
• Commit&push

[TheWranger]

Perhaps there could also be an option in the configuration to block players from setting their main home there? Would be useful for if a server doesn't want to risk being bothered by some of their players asking staff members to move their home.

[robert-beckley]

I would also like to see this added.

[Poslovitch]

Done! Will be released in Alpha 4.