Add complete support for "Rikki & Vikki"

[soundsnow]

gstanton/ProSystem1_3#5

[soundsnow]

libretro/prosystem-libretro#71
libretro/prosystem-libretro#72
libretro/prosystem-libretro#73

[soundsnow]

BupSystem was the only emulator that supported this game

<game name="Rikki & Vikki (World) (Aftermarket) (Unl)">
	<description>Rikki & Vikki (World) (Aftermarket) (Unl)</description>
	<rom name="Rikki & Vikki (World) (Aftermarket) (Unl).a78" size="524288" crc="3ea5d821" md5="b3bc889e9cc498636990c5a4d980e85c" sha1="b26d3125a109fed15e380dc32f2e55d84f350450" sha256="974dc24cbd7a817571aefd12bde86d1730b2c57a436d4d0ad15a094329e1e5a2"/>
</game>

[soundsnow]

https://github.com/mamedev/mame/blob/master/hash/a7800.xml
I can't find Rikki or Vikki here, so MAME must not support it
I'm very puzzled that this game isn't exactly cold on YouTube, but the MAME contributors don't seem to know it exists
And it's a good game

[Augusto7743]

That game not was added in MAME source code.
The cartridge use an custom sound chip and mapper.
The PR links above are related with Prosystem emulator.