Custom shortcut profile creation

[OverloadedOrama]

We can let the players create, save and import their own shortcut profiles. Might not be particularly important for smaller, less complex games, but it could be handy for games that are larger and offer a lot of input freedom, as well as non-game software, such as Pixelorama. It could also be good for accessibility, since the community of a game or software can make their own input mappings for different playstyles or to make the lives of people with certain disabilities easier.