Add hydra cloud saving features to custom games

Currently there’s no way to use the hydra cloud save game features with custom games (the ones that you add the .exe) hydra cloud works fine for steam games that you can see on the catalogue, but I also wanted to sync cloud games with custom games.

Considering that there’s an ugly workaround (using another game from the catalogue as a placeholder and pointing the exe to a custom game so hydra cloud can be enabled) I don’t think it would be too difficult to add cloud hydra support for custom games.

I also think that more people would suscribe to hydra cloud if this was added.