(Emulator request) Dosbox Pure Unleashed

[iconoclusterdotexe]

Please, add Dosbox Pure Unleashed (standalone, not libretro core) to the dos emulators list.

https://github.com/schellingb/dosbox-pure-unleashed/

[Tartifless]

https://www.retrobat.org/changelog-en/

[Tartifless]

Done