*Updated IC2 API.
*Fixed a few bugs in LinkedPowerProvider.
*Fixed Electric Chest NBT data save.
*Registered all items with GameRegistry.
*IStrictEnergyAcceptor for @liquidgithub.
*SideOnly to all client-only classes.
*Proxied electric chest GUI.
*Overhauled sound system to not require direct TileEntity accesses.
*Fixed sounds continuing after server disconnect.
*Fixed /mk version command.