Another update of the arcade emulator for PC.

Changelog:

- fixed bug that some sega games cannot be played.
- fixed sfa3, sfa3u unlocked.
- fixed some CPS1 hack DIPS.
- changed seta2 CPU clock to 16.66666MHz.
- added Mole Attack driver. [iq_132]
- added Ambush driver. [iq_132]
- added Pac-man driver. [iq_132]
- added 1942 driver. [Treble Winner]
- added preliminary irem drivers. [kev]
- updated romsets to match MAME 0.123.

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