Support for #408:
* added slot-0 LC and Saturn 128K for Apple II and II+
* added save-state support
- for slot-0 LC/Saturn, save the LC state in the slot-0 card, not the //e MMU; and switch to a new Apple2 unit ver2
* added g_Slot0, g_SlotAux
* added new LanguageCard.cpp/h to project and moved Saturn code into these new files.
* updated VS2013,2015,2017 projects