Changes to cores since version 1.6.7
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* Atari 800 - Add .atx to allowed file extensions (TSCHAK).
* FB Alpha 2012 CPS2 - Fix CPS Q Sound function that caused bad sound genertion quality when code was optimized. (xianx/twinaphex/bparker).
* Prosystem - corrected Beef Drop database entry for final release version of ROM from game author Ken Siders' website (underball).
* Parallel N64 - Added msvc2013/2015/2017 x86/x64 targets (twinaphex/bparker).
* Parallel N64 - backports from latest sources (AI Shogi 3 should be fixed, audio issues with Pokemon Puzzle League intro should be fixed, etc.) (twinaphex)
* FCEUMM - Added Xbox/Xbox360 build targets (twinaphex/bparker).
* ALL - Added Travis CI build scripts to most cores for various platforms (bparker).
