#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_sk.yml

@@ -35,7 +35,6 @@ not_logged_in: '&cNie si este prihláseny!'
 max_reg: '&fDosiahol si maximum registrovanych uctov.'
 no_perm: '&cZiadne'
 error: '&fNastala chyba; Kontaktujte administrátora'
-unsafe_spawn: '&fTvoj pozícia bol nebezpecná, teleportujem hraca na spawn'
 # TODO kick_forvip: '&3A VIP player has joined the server when it was full!'
 
 # AntiBot
@@ -86,7 +85,6 @@ same_nick: '&fHrác s tymto nickom uz hrá!'
 # TODO email_confirm: '&cPlease confirm your email address!'
 # TODO email_changed: '&2Email address changed correctly!'
 # TODO email_send: '&2Recovery email sent successfully! Please check your email inbox!'
-# 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'