The `setup` command creates a game instance for a channel.
It also has a check to see if one is already setup and a error handler to deal in that case.
I don't think that the check functions can be methods so the 'hack' is to use `ctx.cog` instead of `self` to get the cog instance.
There is also a function to check for the inverted condition preventing double defining every check.
Initializes bot like a regular Cog
Initializes an empty session dictionary
Initializes the class of the session with a possible default value
Changes the group command name to the Cog's name to avoid name clashes in commands
Bibin Muttappillil