Make networking more self contained, open up for possibly new UI modules

[daboross]

The repository is currently split into two crates, the networking directory, and then the main directory containing UI functionality. Ideally the networking module will made more self contained and easier to hook into.

With a plug-and-play networking module providing fully cached, fully typed data, making a new UI should be much simpler, and it should be easier to experiment with the different possibilities.

Currently the only UI is implemented using conrod - and while the project has a good start, it is nowhere near mature. With a solid networking base, we could experiment with either different UI libraries, or a pure OpenGL application using glium, gfx, or raw OpenGL.

This would also open up the possibility of building other tools on this base, such as a terminal application which could subscribe to a room, and print out an ASCII art image of it. (just to grab an idea).