Some feedback messages should be DM only

[dougarley]

Problem: Right now, Chorus posts feedback for every command in a public channel. Particularly with error text. As a result, the channel can be spammed by quite a bit of feedback text.

Examples:

Chorus
01/14/2021
@Starla, An error occurred while running the command: InvalidSsmlException: Invalid SSML request
You shouldn't ever receive an error like this.
Please contact fusion2004#2170.

Chorus
BOT
01/14/2021
@Misael.K, you're not allowed to run compoverse commands

Chorus
BOT
01/14/2021
@Misael.K, Unknown command. Use !help or @Chorus#1555 help to view the command list.

Solution: Send some of that to DMs.

[fusion2004]

I'll have to research this one. I'm pretty sure the error message one should be easy, because I added it. But the other two come from the Commando framework, so hopefully they provide options to change that behavior.