Add complete support for "Rikki & Vikki"

[tachimarten]

Hi,

Here's a pull request with complete support for "Rikki & Vikki", including music. It adds support for BupSystem's BIN/CDF format, so that you can open the Steam FoxBox.cdf in ProSystem and it should run fine.

One of the commits contains a vendored copy of part of BupBoop, which is an emulation of the chip that this game uses. (The emulator, chip, and game were all written by the same author.) This library is under the zlib license, which is GPL compatible.

The first few commits were needed to build on MSVC 2019. If you'd like I can split those into a separate pull request.

There is a corresponding libretro pull request that contains this same code, ported over to the style of that fork.

[soundsnow]

@tachimarten Can you add support for this game for the A7800 or MAME as well? Although I am not sure A7800 is still active and it is based on MAME