Move away from !prefix commands

[Jens-Co]

• Remove prefix related client code
• Remove all prefix related code from our commands
• redo tags class, now we have 1 tagg file class with 2 childeren new commands are /tag fetch and /tag list
• remove unused code overhauled bot.
• remove getAsTag() as thats almost obsolete

[Chew]

All in on the removal for normal commands. Not too sure on tags, though. !! is just easier. Nothing wrong with also having a fetch, but I guess it's here for discussion.