Slash command handler

[warcode]

Handles all /commands by allowing registered callbacks for commands
First to register takes that command
Any entry starting with / will be intercepted and a message will not be delivered
Format is /command this goes as one big parameter

Updated /me as example

[engelgabriel]

I really REALLY liked it!

[engelgabriel]

@warcode I think on the add method, we should allow to pass on a "help" message.. so we can create a /help that will list all /commands

[warcode]

@engelgabriel Yes. That is a great idea.

I considered a /help but there either has to be a way to show a message only to the person who typed the command, or have a bot send a direct message which might be confusing to new users.

[engelgabriel]

Agrees, i think we could even be just a "autocomplete" box... like the mentions.