Revert "WINTERMUTE: Prevent warning about duplicate files when autodetecting."

This reverts commit 4401f40f7203f7aaa78c2e1c904c70902325436c.
WINTERMUTE: Add detection entry for Beyond the Threshold.
WINTERMUTE: Minor formatting fix.
WINTERMUTE: Add detection entry for The Trader of Stories (Demo)
WINTERMUTE: Add detection for Des Reves Elastiques Avec Mille Insectes Nommes Georges

With the accents removed to avoid breaking encoding.