Add admin command, /rtp cancel and /rtp <player> <world>

[mozidevv]

Summary

• /lexonrtp reload - Reload config and message files without a server restart (lexonrtp.admin, default op).
• /rtp cancel - Cancel an active solo teleport countdown via command.
• /rtp - Admin: teleport another player to a world (lexonrtp.admin). Works from console too.
• New messages (en + tr): rtp-cancelled, rtp-cancel-none, player-not-found, reloaded, lexonrtp-help.
• README updated with the new commands and permissions.

Compatibility

• Built against the same Paper 1.21.3 API, Folia-friendly (all scheduler calls go through Scheduler).
• No breaking config changes; new keys are optional.

[Nrleryxx]

/rtp cancel does not reset the title on screen
When the countdown is running the title stays frozen after using the cancel command
MenuListener onMove already calls resetTitle so the command path should do the same

[Nrleryxx]

/rtp cancel does nothing during the searching phase
cancelSoloCountdown only checks the soloCountdowns set but that set is only filled when startCountdown runs
During the async location search the player is only in inQueue so cancel returns false and the teleport still happens afterwards
Call queue remove uuid in the cancel path so the startCountdown guard stops the chain

[Nrleryxx]

toLowerCase without Locale ROOT breaks world keys on Turkish servers
ISLAND toLowerCase becomes islan with a dotless i so the keys do not match
Use toLowerCase Locale ROOT in RtpCommand and BaseRtpCommand

[Nrleryxx]

admin gets no feedback for rtp player world
All result messages go to the target player only invalid world cooldown teleport success and failure
The admin or console sender sees nothing except player not found
Send a confirmation to the sender as well

[Nrleryxx]

getPlayer does prefix matching consider getPlayerExact
Tab complete can suggest cancel twice when a world key also starts with cancel
Extra args beyond length 2 are silently ignored
Console rtp cancel shows players only which is a bit confusing

[toprakdevx]

rtp cancel doesnt work during searching phase teleport still happens after remove player from soloQueue too

[toprakdevx]

rtp cancel leaves title frozen on screen call resetTitle

[toprakdevx]

reload doesnt reload redis call close connect startReconnect