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This replaces old availability checks performed by checking for class
presence with the new @available syntax. I basically replaced those
checks with @available(VERSION) after checking VERSION on Apple
Developer Documentation
Signed-off-by: Carola Nitz <nitz.carola@googlemail.com>
(cherry picked from commit a0087846)

remove blurcategory again from watch since the accelerate framework is only available on watchOS 4 and crashed on all older watches

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

(cherry picked from commit 03a07661)

(cherry picked from commit 3b460694)

thumbnail cache: remove very bad had hack to handle album art as this is correctly done by MLKit now

thumbnail cache: add a way to fetch stuff at random sizes and if the caller believes that it should replace the cache copy, it can ask the cache to do so

use instance variables instead of static vars rename -initialize to -init so it gets actually called

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

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

Thumbnail cache: expand internal API so we can also ask for artwork based on meta data in addition to MLFiles

Thumbnail Cache: fix exception as NSCache doesn't like to store inexistant objects which can occur if libvlc didn't finish providing thumbnails yet