Refactor Network and Packets

[Eurymachus]

I'd actually like to bring the execute implementation into the packets and remove the getCommand and setCommand. Possibly looking at either class storage OR (preferably) a command indexing system or alternatively a channel per packet type and then packetIds being the 'commands'.

Right now I think that the abstraction is great, however I think we may be able to simplify things. I'll have to look deeper into it.

[Eurymachus]

At the moment we essentially have a Super channel with sub channels (i.e. command strings)