Support for web-based platforms and connecting to services about glc HOT 3 OPEN

For Steam, a quick-and-dirty solution would be:

1. Only works if the user's profile is public; send them to this URL to change: "https://steamcommunity.com/my/edit/settings"
2. Request the user's username, and collect the data from this page: "https://steamcommunity.com/id//games/?tab=all"
3. Send the user to "steam://install/" to launch Steam and install any particular game.

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Implemented Steam method above in this commit. Unfortunately, DLCs end up in the list.

EDIT: Note this is a just a start, since the internal databases were sufficient for Amazon, itch, Indiegala, and Paradox [EDIT 2: also GOG], and I figured I'd slap this together since it was easy. Now I'll take a look at the various web APIs, and come back to Steam to do it right.

EDIT 3: In PR #56 , I added a commented-out experiment with the Steam API (via SteamWebAPI2), but it appears to just complicate things (e.g., the user must set up an API key) and it doesn't make a difference from using the website (i.e., profile must still be public).

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The Origin API was implemented in PR #56 , as well as an internal database solution for Epic.

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