Lucky respawn booster

Two commands :

/core buylucky <playerName>

Adds one booster.

Permission : core.respawn.buylucky

/core runlucky

Runs the booster (requires player context)

Permission: core.respawn.runlucky

How it works:

Every time a booster is run, the LuckyBoosterMinutes: 720 from respawn.yml amount gets added to current amount stored in `storage\respawn.yml. When the booster is active, all players will spawn with 100% lucky spawn.