-igs/goldstar.cpp: Consistent naming for more DIP switch settings.

* Also order payout rate settings from least to most generous, and
  key-in is not coins.

-sequential/sixtrak.cpp: ROM_OPTIONAL is effectively deprecated and
 should not be used in new code.  It's always led to trouble.

-olivetti/m24_kbd.cpp: Don't set the player number explcitly o some but
 not all "player" controls.

Author: cuavas