Rename BaseGuiScreen.
Start Work on new GUIHandling code. Currently only used by the soldering station.
Add missing client side only annotations.
Fix 374.
Move the Extractor Module GUI to the new GUI system.

ModuleGUIs now reopen the Chassis GUI directly and not the previous one.
Added missing @SideOnly(Side.CLIENT).
change getClientGui to return an Object
Change ItemSink to new GUI system.
Move all SolidBlock GUI's to the new system.
Move Upgrade Manager to new GUI system.
Move ItemManager to new GUI system.
Move ItemAmountSignGui to the new GUI system.
Add missing setSlot. Fix issue #377.