Make 1.6+ work with new instance format.

logic/VersionFilterData.h

@@ -2,6 +2,7 @@
 #include <QMap>
 #include <QString>
 #include <QSet>
+#include <QDateTime>
 
 struct FMLlib
 {
@@ -17,7 +18,9 @@ struct VersionFilterData
 	QMap<QString, QList<FMLlib>> fmlLibsMapping;
 	// set of minecraft versions for which using forge installers is blacklisted
 	QSet<QString> forgeInstallerBlacklist;
-	// set of 'legacy' versions (ones that use the legacy launch)
-	QSet<QString> legacyLaunchWhitelist;
+	// set of 'legacy' versions that will not show up in the version lists.
+	QSet<QString> legacyBlacklist;
+	// no new versions below this date will be accepted from Mojang servers
+	QDateTime legacyCutoffDate;
 };
 extern VersionFilterData g_VersionFilterData;