NexusShout 1.7.2

Fixed

PremiumVanish and SayanVanish were never detected, so vanished players were not hidden. Both are detected now. SayanVanish 1.4.0 to 1.7.3 is supported; other versions are not hooked, and a warning is logged.
default-locale had no effect. It is now used when a player's client language has no file, and for everyone when detect-player-language is false. If it has no file either, en_US is used and a warning is logged.
nshout.vanish.see was checked on the vanished player instead of the player looking. Vanished players are now hidden from /nmsg and its tab completion for players without the permission. /nr still reaches a vanished player while you are the last player they messaged or got a message from.
Private messages and global chat shared one cooldown and one anti-spam history. They are now separate, using cooldown and private-messages.cooldown, also with multi-proxy cooldown sync.
Joins, leaves, and server switches of vanished players were posted to Discord. They are now skipped. The join is now posted when the player reaches their first server, and a player who disconnects before reaching any server gets no join or leave message.
A rejected login with the name of a player who is already online cleared that player's global chat toggle, /nr target, and multi-proxy roster entry, and posted a false leave message to Discord. Fixed.

With multi-proxy, players who were vanished when they last joined or switched servers are hidden from /nmsg, /nr, and tab completion on other proxies, even for players with nshout.vanish.see. Someone who vanishes mid-session is not hidden on other proxies until they switch servers.
Two comments in the default files were corrected: the formatter default in config.yml is smart, and use-embed in discord.yml works with webhooks too. No settings changed.