Core: Check for VDF files before selecting Steam install directory #231
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Following discussion in #226 (comment), it appears Steam install folders can exist and have the valid directory structure, but not the actual files that we need.
This PR addresses this by changing the
_STEAM_ROOT
selection check. Now we check thatconfig.vdf
andlibraryfolders.vdf
exist in the given Steam root dir, as if they do, that implies_STEAM_ROOT/config
exists as well, so no need to check that as well.