get Preferred Prefix
Returns the preferred prefix this bot is able to respond to, in the specified guild, or null
if no prefix could be determined, in which case text commands are not usable.
As a reminder, TextPrefixSupplier.getPreferredPrefix takes over the prefixes set in BTextConfig.
Deprecated
Now requires a GuildMessageChannel
Replace with
this.getPreferredPrefix(channel)
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Returns the preferred prefix for triggering this bot, or null
if BTextConfig.usePingAsPrefix is disabled and no prefix was added in BTextConfig.prefixes.