Update Discord.js to 13.8.0

[Einarin]

WIP but putting this up in case others see or want to contribute.

I believe this is basically ready to merge now. Every command either works or is disabled. The only major regression is that the loop isn't supported due to the way the new unified playback queue works.

Status:

• [x] Logging in to Discord
• [x] Send/receive messages in Guilds
• [x] Send/receive messages in DMs
• [x] Test all text commands
• [x] Deal with the voice commands being split out into a separate library
• [x] Test all voice commands

[Einarin]

@chalda are you going to review or should I just merge it?