GraphicSevenSeg: Fixed bug where, if sim was powered off, segs would be
null
GraphicGen: Made mux/demux smaller
Added RAM class to sim
EditorClipboard: Fixed NPE bug
HistoryManager: comments
GraphicGen: Added generateRam()
Toolbox: Added RAM
Toolbox is getting too big.  The more complex components should be in
menus instead.
ComponentType: Added RAM