Tony Crisci authored Sep 30, 2018 and Victor Toso committed Feb 08, 2019

The Steam Store API plugin fetches Steam metadata from a Steam app id.

From discussion in !33
 > In gnome-games, we get the ids from the file system. Steam has
 > registry files at ~/.steam/registry.vdf and
 > ~/.local/share/Steam/steamapps/*.acf which contain the application ids
 > of the installed games.

Fixes #29