Creates an instance of DiscordClient.
the ClientOptions
The BotClient
Sets or gets the default captureRejection value for all emitters.
This symbol shall be used to install a listener for only monitoring 'error'
events. Listeners installed using this symbol are called before the regular
'error'
listeners are called.
Installing a listener using this symbol does not change the behavior once an
'error'
event is emitted, therefore the process will still crash if no
regular 'error'
listener is installed.
The DiscordClient class is a special class it's effectively the discord.js Client class but with a magic circular reference to the BotClient class (bot).
The only time this class should be called is in the BotClient class.