Automatically detect supported games via launcher through common locations like steam

Steam is probably the most used way to buy and download Bethesda games.

We can leverage this to make installation of OpenMW just that much easier by automatically detecting if the games we support, like Morrowind are available. We can pre-fill this in so that the end user does not have to hit the locate button if they don't want to.

We've detected the following game(s), would you like to set up OpenMW to play the following?

• Morrowind: ( C:/Users/joe/Steam/... )

This assumes the default Steam location found, or a lookup in the registry to find where Steam is located. Then based on this, where Morrowind is installed.

We can lookup and use the appId for Morrowind and later games.