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first hit at seperating viewpresentation from the underlying media management. Moved the _foundmedia array into it's own class VLCMediaDataSource.m.
This way a lot of duplicated logic got removed when accessing this array.
That way it won't be accessed without the synchronized block and the UpdateViewContents method was cleaned up as well.

(cherry picked from commit 04cba7242cd008f155107c3894ab72e6dfbdfc2e)

Manual forward-port of 684dd29a

renamed the PlaylistViewController to LibraryViewController since it was never a playlist in the first place

(cherry picked from commit 3c7fd852)

(cherry picked from commit 9e0c6135)

(cherry picked from commit 3b460694)

(cherry picked from commit 769867c8)

MLFile now stores relative path in the path property. the absolut path/url can be accessed by using the property url which returns an NSURL

adjusted the ThumbnailCache to handle different filetypes itself to remove complexity from other controllers

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

On iPad, right swipe on cell, on phone/pod, long touch to display

Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

No functional change

library: fix KVC related pseudo-random crashes because we didn't remove the observers on dealloc, so observed objects tried to access nil observers

Side note: don't listen on properties you don't care about

library: fix race conditional crash which could be triggered by uploading > 20 small files with parseable meta data

thumbnail cache: implement more efficient and elegant way to update the thumbnails for folders and shows

library: optimize folder thumbnailer so we don't need to re-create the split imagery on every draw event. add support for retina displays