Support for open-retro database for autoconfiguration

Created by: i30817

FS-UAE launcher uses the open retro game database to auto config and boot several kinds of dumps (including whdload).

This program 'solves' many things that make playing amiga games extremely annoying, including model and settings, but also 'automatically create a hd image for whdloads' and 'cache that copy so you can keep the image without modifying the original' and is also planning to catch the whdload quit event to send the specific whdload quit command (it needs this to write buffers to disk because for speed, whdload usually only writes to file on quit).

I'd love something like this in retroarch (along with a continuously updated whdload hash database).