The playlist media can now be sorted based on different criteria just
like other types of collections.

By default, VLCMediaLibraryKit will be compiled with and linked against
version 4 (pre-release) of VLCKit. To make this work, a patch against
libmedialibrary will be applied automatically to backport a
deinterlacing API change.

We need to be more precise when formulating simulator vs device compilation flags.

This fixes #28 and does not change the public API.