UE4
- added -game=ue4.n tags, added "Unreal engine 4.n" for selection from UI
- improved appSetRootDirectory2() logic: when path contains "Contents/Something/Textures", "Contents" will be selected instead of "Textures"
- fixed name table loading for unversioned UE4 packages: "Summary.FileVersion < 64" always returned true, but that code was made for UE1