Suggest about command prefix

## Describe your suggestion
Baritone command prefix should support string that starts with "/"
which prevent a lot of mis-send
In current version, when prefix is set to string like /#,the tab works while  the command doesn't work

## Settings
Nop

## Context
Nop

## Final checklist
- [x] I know how to properly use check boxes 
- [x] I have not used any OwO's or UwU's in this issue.
