Play a VIDEO_TS Folder as a DVD (Like the VLC Desktop App Can)

Add a isMain method to IFile interface
Refactor various IFile users to use isMain instead of the type directly
Add a disc type
Refactor various sql request to handle the disc type as well
Add a special handling in FsDiscoverer to know about DVD/BD folder hierarchies
Add a fake DVD hierarchy in the samples tests?

I'm not sure the last step can be done easily, but if we could generate a dummy DVD, that would be great in order to test for this automatically.

Edited Dec 05, 2018 by Hugo Beauzée-Luyssen

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