now load and play test ROMs, complete with emulation of timing delays
due to slow accesses on real Harmony hardware.  Still TODO is the tunes,
DPC+ stuff, which is stubbed out at this point.

Fixed bug in EFSC bankswitching; state files didn't contain extended RAM
information.

Cleaned up the Serializer API, resulting in slightly faster operation
and smaller state files.  Because of this, the state file format
has changed for this release (old state files will no longer work).


git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@2487 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba