Automatically create command for user based on name and platform

[jmshgs]

• [x] mac: use name as application name and use this template to launch open -a "<app name>"
• [x] steam: query IGDB for game, get the SteamID, and create a open command to launch the game automatically

will come up with more later

[jmshgs]

works when games are autodetected, still needs implementation when manually added.

[jmshgs]

mac done in #139 steam done - idk when