Changed the way networks work to create modular possibilities in the future
Networks now are rooted in IGridNetwork, a generic class that is based upon a network core class, a conductor type and an acceptor type. IElectricityNetwork is simply a subclass of this, using IElectricityNetwork as the core class, IConductor as the conductor type and a normal TileEntity for the acceptor type. cleanUpConductors() has been merged into refresh(), which is now also a part of IGridNetwork. Las but not least, IConnectionProvider is now named INetworkConnection for this new system.