(MESS) converted scv and vboy to use slot devices for
their carts. nw.
new clones
Zero Hour (Inder) [Basilio García]
namcos2 and namcos21: moved most remaining functions into classes (nw).
spi_layer_bank_w unknown bit wasn't alpha blending enable afterall
(MESS) HDC9234 still WIP, added some more functions and burst mode.(nw)
Fix compile (unused variable issue) (nw)