-sun4.cpp: Various changes: [Ryan Holtz]
* Split sun4 and sun4c hardware emulation into separate derived classes.
* Hooked up Sbus IRQs.
* Removed now-unnecessary duplicate MMU code.
-cgsix.cpp: Added VSync IRQ, cleaned up save state usage, and added THC MISC register. [Ryan Holtz]
-sparc.cpp: Renamed MB86901 to SPARCV7, and added a separate class for SPARCV8. [Ryan Holtz]
-bt45x.cpp: Made logmacro.h usage more consistent. [Ryan Holtz]