GXemul Code2

Better text.

Adding NetBSD/dreamcast LiveCD screenshots.

SH4 fixes (adding a PADDR invalidation in the ITLB replacement code in memory_sh.c); the NetBSD/dreamcast LiveCD now runs all the way to the login prompt, and can be interacted with :-)

Moving of_data into the md struct.

FINALLY removing the md_int struct completely from the machine struct.

Converting dev_z8530 to the new interrupt system.

Completely removing src/machines/interrupts.c, cpu_interrupt and cpu_interrupt_ack in src/cpu.c, and src/include/machine_interrupts.h! Adding fatal error messages + abort() in the few places that are left to fix.

*** empty log message ***

Converting dev_mp to the new interrupt system, although I have not had time to actually test it yet.

Fixing the JAZZ timer (hardcoding it at 100 Hz, works with NetBSD and it is better than a completely dummy timer as it was before).