Added Double Tap Gesture to play/pause action when Mini Player is active

Created a custom double tap gesture with variable for max delay for tap. when mini player is active user only can play/pause by only using mini player buttons.

For better user experience, i added a tap gesture on MediaCategoryViewController and all media collection view cell types that enable user to double tap at any place on the screen to play/pause mini player.

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Hello @fkuehne can you review my merge request?

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closed