#1116 #1117 Add command usage hints and remove unused message keys

- Add usage message on argument mismatch where available
- Remove unused message keys
- Create tool task to search for a message key's usages and to find unused keys

src/main/resources/messages/messages_eu.yml

@@ -31,7 +31,6 @@ not_logged_in: '&cSaioa hasi gabe!'
 max_reg: '&fKontuko 2 erabiltzaile bakarrik izan ditzakezu'
 no_perm: '&cBaimenik ez'
 error: '&fErrorea; Mesedez jarri kontaktuan administratzaile batekin'
-unsafe_spawn: '&fSpawn-era telegarraiatu zara'
 kick_forvip: '&cVIP erabiltzaile bat sartu da zerbitzaria beteta zegoenean!'
 
 # AntiBot
@@ -82,7 +81,6 @@ email_added: '[AuthMe] Emaila gehitu duzu !'
 email_confirm: '[AuthMe] Konfirmatu zure emaila !'
 email_changed: '[AuthMe] Emaila aldatua!'
 email_send: '[AuthMe] Berreskuratze emaila bidalita !'
-# TODO email_exists: '&cA recovery email was already sent! You can discard it and send a new one using the command below:'
 # TODO email_show: '&2Your current email address is: &f%email'
 # TODO incomplete_email_settings: 'Error: not all required settings are set for sending emails. Please contact an admin.'
 # TODO email_already_used: '&4The email address is already being used'