Miscellaneous late 90s Jaleco HW fixes and cleanups

[angelosa]

ms32.cpp, bnstars.cpp, tetrisp2.cpp: wrote a Jaleco MS32 System Control Unit device [Angelo Salese, Alex Marshall]

• Internalize both CRTC and irq generation, overall timings should be more accurate;

Additionally removed a plethora of kludges, most notably:

• ms32.cpp: Fix sprite transfer direction bit, removes an ugly per-game table;
• ms32.cpp: Fix drawing honoring the wrong variable and causing a segmentation fault;
• ms32.cpp: Correct palette size;
• ms32sprite.cpp: Move optional features (YUV, zooming) at init time;
• tetrisp2.cpp: Fix extra screens in stepstag/vjdash to run at 60 Hz instead of 30;
• tetrisp2.cpp: Fix rightmost screen in stepstag/vjdash bitmap configuration (thanks to Osso for catching it)
• bnstars.cpp: Fix machine configuration and proper split for sprite and gfxdecode devices;

[angelosa]

Looks like with bleeding edge I need to update all the pointers to use memory_share_creator. causing a crash at access time otherwise. Given also the problem with bnstars1 I may as well just split & subclass core state into something more reusable.

[angelosa]

All that's left for this branch is make some merging between memory maps (especially for bnstars.cpp), separate F1 Super Battle to use its own state machine (derived from ms32_state), and of course convert configure_scanline to use an emu_timer instead.

Of course it's not "completely clean" but I really like to rename bnstars.cpp to ms32_bnstars.cpp from master branch because that bothers me as well.

[angelosa]

Ready for primetime imho, given it also fixes current ms32.cpp driver breakage on master branch.