ROM Hack Downloader

[Libretto7]

Lets the user list and install available romhacks which are compatible with their roms.

EDIT: Todo list

• [ ] place hacks in "hacks" subdirectory
• [ ] RomM-compatible hack names "Hackname [v1.2][variant].gba"; for translations "Basename [English][v1.2].gba"
• [ ] add type ("translation" or "full hack") entry to db
• [ ] make it possible to update hacks (and back up save games)

To test this, have Super Mario World (USA) in $roms_folder/snes and/or Super Mario Bros. (World) in $roms_folder/nes (uncompressed).

[Libretto7]

It's probably better to insert the compatible base crc32s and paths into the database instead of the bash dict. This will make it easier for Godot to access this info

[XargonWan]

Created an internal branch here: https://github.com/XargonWan/RetroDECK/pull/699