CocoMUD client

CocoMUD is pretty straightforward in execution. Its SharpScript engine executes code as it should in a single, blocking thread. Options like timers, speedwalking and anti-idle would require to be able to pause.

Although all these features don't really need the SharpScript engine extension, it is a good opportunity to provide a #sleep SharpScript function that takes a number as argument and pauses (without blocking). We'll have to use twisted's ability (asynchronous support) in order to do this.