just getting my feet wet with iProject_3. Added clearmem command, which
calls clearallmemory function from the MMU. Now, we need to get the
memory display to show all memory - not sure how I want to do that yet.
Maybe just one large running list?

I think I might remove some functionality from memory. Let the MMU
manage everything and the "system memory" just allow to be written too
or read from, but does not care about clearing itself out or anything
like that... or maybe it does care but in smaller chunks than "all"