MemoryCard / Multitap Renovations:
* Memorycards should now support multitap (somewhat untested)
* Implemented a memorycard plugin interface, using the new API defined in PluginCallbacks.h (still prelim and hackish)
* Memorycard settings are saved to ini!
* Multitap is now controlled by PCSX2 instead of the pad plugin (which means no multitap until we implement the gui toggles to enable it)
git-svn-id: http://pcsx2.googlecode.com/svn/trunk@1817 96395faa-99c1-11dd-bbfe-3dabce05a288