[Feature Request] Add support for QuickDisk format

[Anuskuss]

Games dumped off the Famicom Disc System come into two major types:

• .fds format: Most common format. Ubiquitous in ROM sets (GoodSets, No-Intro). Omits some checksum data.
• .qd format (stands for QuickDisk): Only ever used in official Nintendo re-releases. Almost identical to fds, but a full dump with checksum data. May omit padding.

The checksum data in question would be checked at BIOS startup to verify the integrity of the image and whether it was tampered with, in which case it will throw an anti-piracy error. As of now, no NES emulators support the alternate more complete dumps, as well as fudging that check's result to always return a negative. To emulate a .qd image, stripping the checksum data with a custom script is needed.

— Emulation General Wiki

See this script for more information: https://gist.github.com/einstein95/6545066905680466cdf200c4cc8ca4f0