Add the option to hide deleted messages

[PatheticProgrammingPerson]

Currently, when you or someone else deletes a message, it leaves behind a Messege deleated note with the sender's name

While this does have its uses, it's also a bit messy

[aaronraimist]

@PatheticProgrammingPerson This feature already exists, it's called "Show a placeholder for removed messages".