Add Beetle PSX HW core like in RetroArch for more accurate emulation

[Repp12]

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[x64x2]

Why?

[Repp12]

Because Beetle PSX HW is a fork of mednafen one of the most accurate psx emulator aside from Xebra (which is closed sourced).

The accuracy would make it be able to play more games than other cores. For a test of accuracy, try playing Bust a Groove games 1 & 2. The only emulators that I know that can play those games without slowly getting desynchronized with the video/input and music are those two (but feel free to add more if you know). All other psx emulators that I tested can't play those games without desync. There are others games that have issues aside from that such as the music in Monster Rancher 2 etc.

All of these would benefit from a more accurate emulator.