*Fixed GUI not showing up for Refined Obsidian.
*Fixed brightness for incorrect blocks.
*Fixed no shift-clicking support for output slots.
*Added core color support.
*Re-added color for Theoretical Elementizer, Credits GUI, and update
notifications.
*Renamed ThreadUpdate to ThreadClientUpdate.
*Added server update thread.
*Added Obsidian Ingots server command handler.
*Added server command 'oi.'
*Added server command 'oi update.'
*Touched up on GUI and Container code.
*Fixed NPE on loading NBT data when BuildCraft isn't installed.
*Fixed charging/discharging IC2 batteries not working.
*Added getDisplayedEnergyNoColor() method.
*Various improvements and fixes.
*Bumped version to 4.2.1.
